science-help

[odd ibex]

left

k nvm

we lost the bet

[viral sorrel]

since molar mass of nitrogen is 14.0067, n=300/14.0067=21,42
V=nRT/p
we know n, R=8,31 T=305 and p=50000

[steel basalt]

Ohh nitrogen gas consists 2 nitrogen?-

[viral sorrel]

yep

[steel basalt]

I took 300/28

[viral sorrel]

hm

yeah i forgot about that

you're right then

mb

[steel basalt]

Ohh

Alright

Ill ask the teacher bout it today, thank you too

[viral sorrel]

np

[steel basalt]

I got the answer, it will be 0.0523 and my mistake was i counted 101325 as 10325 so ye that’s all

[viral sorrel]

cool

[olive kelp]

How would you be able to quickly distinguish between a ketone, amine and organic acid? Besides smelling it, and all of them are colourless organic liquids

[south turret]

for amine you could do carbylamine test in which the product gives a foul smell, for ketone you have sodium nitroprusside test and the product is red colored, and organic acid can be tested by adding sodium bicarbonate which would give effervescence

[winged sage]

Hey guys I'm having trouble understanding how my professor got the answer to this question (this is for my Gen. Biology 1 class):

( I attached a picture of the question) Calculate the mass - volume ratio as % and as mg/ml for the following:

10g of salt in 200ml of water
______%
______mg/ml

The correct answer is 5% and 50mg/ml

However I can't figure out the math in which he did this - I attached a screenshot of how I tried to solve the problem and the answer I got was 2,000 and 0.02 mg/ml

I'm stumped

[copper saddle]

maybe try 10/210 *100

because for mass to volume ratio, volume is taken as volume for the whole solution

[solemn cave]

in the first part just do
mass of solute/volume of solvent ×100
=>10/200×100=5%

[solemn cave]

and then in the second part to get it in mg/ml convert g into mg (multiplying by 1,000) so u get 10g= 10,000mg
the question isn't asking in percent so dont multiply 100
= 10,000/200
=50 mg/ml

[winged sage]

THANK YOU SO MUCH!!! I see now that my math was off I appreciate your help!

[solemn cave]

Yes of course <3

[thorny gyro]

how do i retain organix reactions

[topaz pasture]

write them on your walls

[thorny gyro]

oh

[rapid magnet]

who studies chemistry

[thorny gyro]

me

[thorny gyro]

i am right now

[rapid magnet]

cool

[rapid magnet]

me too

[thorny gyro]

do you need help?

[rapid magnet]

I need help with hydrocarbons

[thorny gyro]

sure! how can i help?

[rapid magnet]

Special exercises for aromatic hydrocarbons, I find it difficult to solve them

[thorny gyro]

can you give an example question?

[rapid magnet]

Like writing its equation and formula

[thorny gyro]

oh like they give u a diagram and u gotta write it's formula?

[rapid magnet]

yes

[rapid magnet]

I find it difficult to solve

[thorny gyro]

ohhh

[rapid magnet]

I just studied it yesterday

[thorny gyro]

so suppose they give you benzene, draw the ring with the double bonds in it and draw write a carbon at each corner

now just fill the 4 bonds of carbon with hydrogens

then count all the carbons and hydrogens

you will get

c6h6

[rapid magnet]

It seemed difficult to me

[rapid magnet]

Thanks for giving me a good example

[thorny gyro]

try it with different examples it'll be fine

[rapid magnet]

thanks

[rapid magnet]

I wish you success in your study

[thorny gyro]

thanks !

[rapid magnet]

I'm a student in chemistry and getting started seems a bit difficult

[thorny gyro]

i must clarify that the carbons will already have 3 bonds cuz of the ring, so each carbon will have one hydrogen

[thorny gyro]

yeah it's harder to visualise things unlike physics but you will get the hang of it soon!

[rapid magnet]

I know

[rapid magnet]

I hope so

[thorny gyro]

yes i did a typo and wrote c6h5

[rapid magnet]

oh hhhh

I also made a lot of mistakes in it

[thorny gyro]

yeah happens

[rapid magnet]

Something that anyone can comprehend

[rapid magnet]

The problem we suffer from is the method of teaching

There is a defect in the delivery of the idea

[thorny gyro]

oh these

these are very basic

[rapid magnet]

alkanes

[thorny gyro]

yes

[rapid magnet]

ya

[ashen sparrow]

what is the difference between a sign and a symptom

[gilded forge]

Iirc a sign is some form of the disease that the doctor sees but the patient doesn’t

And vice versa

It’s like if you bruised yourself
A sign is the obvious purple/blue appearance of the affected area which others (also you) can see
A symptom is something that has to be identified by an expert in the subject for example: the destruction of vascular cells under the skin caused by the bruise

Hope it’s clear, I took it 1.5 year ago and in a different language

[thorny gyro]

you mean symptom according to the text following this

[gilded forge]

Correct

[ashen sparrow]

thank you ❤️

[cerulean solar]

anyone good at retrosynthesis??? for organic chem

[odd ibex]

Is it but 2 yne or but 1 yne that give red precipitate when treated South ammoniacal curpous

[odd ibex]

When treated with*

[south turret]

could try

depends on the level of the question

[odd ibex]

any one of these

._.

[thorny gyro]

8th or 9th

[odd ibex]

Whichever you can solve

:3

[thorny gyro]

9th is d

[ashen sparrow]

what are the signs and symptoms of tuberculosis?

[sturdy stump]

I'm not too sure how to find P and Q

[thorny gyro]

what are the rectangles

[sturdy stump]

resistors

[thorny gyro]

any other info given?

[sturdy stump]

no

[thorny gyro]

there has to be cuz V= I x R

and only I is given

add the 3 to get 1 single resistor

[sturdy stump]

that's what i was thinking, too

i'm not sure if it's even possible

[thorny gyro]

that's what

[sturdy stump]

i'll try asking my teacher, thanks for trying to help though

[south turret]

p should be 1.2A

and q 0.2A

p 1.2 cuz resistor doesnt affect the current

and q 0.2 due to junction law

[sturdy stump]

oh right, i forgot about that

great, thanks for the help

[brittle fjord]

how is this the basis of this unit cell?

[shadow flare]

Parallel or series ? I think parallel because resistance proportional to heat but in answer key it was in series.

[plain violet]

Proteien classification based on nutrition is it
Simple conjugated derived
Or
COmplete and incomplte protens s

Need it for an exam

[small scroll]

Heyy i found a site you can check from https://www.fao.org/3/x5738e/x5738e04.htm#:~:text=1.1 Classification,-Proteins can be&text=Examples are%3A albumins%2C globulins%2C,%2C phosphoproteins%2C haemoglobins and lecithoproteins.

[stone junco]

um a question to jee/neet aspirants:
how did you go about picking which entrance exam to crack? i'm currently in 11th and i am not sure what is right for me, i like both bio and math😭 wud love to hear your thoughts

[topaz pasture]

I wanted to feel something

so I selected PCMB

but I did not like the feeling

so as to feel nothing again I joined allen

now I want to become nothing

so I am moving to kota

[topaz pasture]

just choose based on what you wanna become professionally rather than what subjects you love (not like completely exclude them but you get what I mean) and choose your entrance exam to crack. As simple as that.

[thorny gyro]

understandable

[thorny gyro]

Are you sure you wanna do engineering/doctorate? make sure you leave other ends open because you never know when it'll hit that you chose wrong unless you are very much into it already.
IF there is no pressure from anyone like parents you should go what you like the best but I get it, "JEE", ik some friends who prepared for both and you can do it too cuz the physics and chem are pretty much the same, the workload comes on maths which you should just practice everyday how much you can, I did not take biology but from what I've heard people score easily there so you should be fine with sneaking that into your schedules

[nimble steeple]

Guys is it just me or is this a printing mistake?

[thorny gyro]

What is it that's bugging you here?

[nimble steeple]

The 6 suddenly turned to 60

mass of earth

[thorny gyro]

then it is obviously a typo

[nimble steeple]

Yeah but I just wanted to double check

[sudden steeple]

Are Images formed by convex lens laterally inverted?

[small scroll]

It depends on the placement of the object... If the object is placed beyond focus, the image will be real and laterally inverted. If the object is placed between focus and centre of curvature of the convex lens, the image will be virtual but not laterally inverted.

[sudden steeple]

oh thanks

[prisma prism]

Hey does anyone like have pdf for mtg fingerprints for physics?

[winged horizon]

does anyone know what formulas were used for this?:((
I'm really struggeling with solving this one, I have different numbers than my friend

[thorny epoch]

where is the question

i cant see it its a little blury

[thorny epoch]

,

i mentioned you to see my replies

[winged horizon]

is this better?

[fiery crown]

can ya tell me important topics for class 10 science

[thorny gyro]

carbon and it's compounds and light chapter

[thorny epoch]

is this the motion of charged particles in a uniform magnetic field

[stone junco]

@topaz pasture hm is there something you wish you had done?

@thorny gyro yeh that's a good thing to have in mind, had last final exam today, studying for the boards has been pretty easy

[thorny gyro]

10th is easier than 9th

no lie

[stone junco]

i am in 11 rn :)@thorny gyro

[thorny gyro]

ohh im in 12th

[stone junco]

but yeh state board, was in cbse till 10th

@thorny gyro oh your having your exams?

[thorny gyro]

yes

[stone junco]

cool, all the very best

[thorny gyro]

thanks a lot

[echo jay]

Hello everyone, need help with Organic Chem and Electrolysis. Please help me😩

[thorny gyro]

aye what is it

[echo jay]

@thorny gyro I find it difficult to understand these topics

[thorny gyro]

oh

in organic

try to find similarities and differences

A lot of reactions can get confused with each other which is very common so you need to learn or write them together so whenever you read you remember the specific differences
And having a broader picture in organic chem is much more helpful than learning in a specific way, try to draw reaction maps like write down a compound in the centre of the page and then from there write all the possible reactions with different reagents from that one compound

[thorny gyro]

the differences are important here and they are very minute at times

this is an example

make these instead of writing down every reaction, saves time and easier to understand

[wintry ginkgo]

Hi yall! Can someone help me find the optical rotation of this? (It's in french. It's question 5) idk how to do it. Thank you!

[south turret]

in 1 the chiral carbon on left has R configuration and the one on right has S configuration

you know R, S nomenclature right? the priority order and when its clockwise its R and S for anticlockwise

not sure about the one in 2nd tho

[thorny gyro]

Hey, can anyone help me with this question? It's eating my entire brain up

We have to find current at i

[thick hedge]

try using kirchoff's rule and separating the circuits into 3 different loops

[thorny gyro]

Man, i tried every rule that has existed, but i can't solve it

[thick hedge]

wait lemme try

i think i got it

you essentially assume this as a wheatstone bridge

and then ignore the 5ohms resistor in the middle

wait that also doesnt work 💀

[thorny gyro]

It was so easy when my teacher was explaining it in the class but i don't know anything now lmao 💀

[thick hedge]

bro its kirchoffs but the calculation is messy

im about to finish it tho

gimme a sec

[thick hedge]

yooo got it

its actually way easier than i thought

you dont even need kirchoffs

[thorny gyro]

Can you show the solution?

[thorny gyro]

My brother in Christ, i still haven't got the answer

[thick hedge]

my man oh shit sorry T-T

i totally

i got carried away with something else 😭

wait so

but since

they asked current at that specific loop, you have to go through thr trouble of calculating induvidual current through each resistor given there

you do this

[thorny gyro]

Hmmm

[thick hedge]

wait

do you have an exam on 6th march

[thorny gyro]

Nah

[thick hedge]

okay then

[thorny gyro]

But in the question, i have to find the current through the 4 ohm resistor

The answer is 5/3

But how the answer came, i have no idea

[thorny gyro]

Ayo bro, i think I'm onto something

I think my sir taught us a trick

Nah i don't think I figured it out.....

[thick hedge]

Shit okay

I didn't get the final answer tho

But then

The approach is right

Verified with a couple of friends

[thorny gyro]

I asked someone else and this is how he solved it

[thick hedge]

ok shit i feel dumb now T_T

[thick hedge]

yo a small doubt

wont current divide equally only if you have equal resistances?

oh ok got it mb

the other part is also 10 ohms?

is that right

[thorny gyro]

No, both are connected in parallel, that's why they got distributed equally

[thick hedge]

even if you connect in parallel, do currents get distributed equally to parallel circuits?

[thorny gyro]

If you solve it, you get 10 ohm, but that's not why they get divided that way

[thorny gyro]

Yeah, in parallel they do

[thick hedge]

okay basically current in = current out

makes sense makes sense

[thorny gyro]

Yeah

[thick hedge]

i still have doubts about the equally splitting part but nvm

[thick hedge]

Yo just checked with my teacher, he says current does not divide equally for a parallel circuit unless it has equal resistances

[thorny gyro]

It doesn't?

[thick hedge]

Apparently it doesn't

Has to do with potential difference of the circuit

[thorny gyro]

Oh ok, it doesn't I'm just dumb

[ancient scarab]

hi, i need help with this

[final cloak]

I tried adding the ke and pe

but it dindt work and i tried just using both of them separately

[brittle fjord]

Anyone know why V Thevenin is 3vx = 20v?

[thorny gyro]

Omega=√(spring constant/mass)
And then total energy=0.5xmassx(omega)^2x(Amplitude)^2
Didn't it work?

[final cloak]

uh nah

i got 0.0223 n i alr checked its not the answer

[dreamy spade]

don't forget to turn cm to meters and grams to kilograms

[final cloak]

yea i did

this is the last problem i have left im prolly jus gonna askt eh teacher on monday but if u know waht to do lmki

[dreamy spade]

what is the answer?

because 0.0223 is definitely correct

so probably the author of problem is wrong here

[final cloak]

its UT quest

so its a website where teachers assign auto generated problems

and then u input it in

ion think ive ever had a issue wit it

wait it just worked

💀 sig digs

i thoguth my 2nd response was 0.223.........

[dreamy spade]

the 4th one is technically correct

just rounded

[dreamy spade]

really want to help but don't speak burrito, give a context

[dreamy spade]

We know from sum of currents that Vx=20/3.
Also we know that if there is no current through 2 Om resistor, then Voc just equals 3Vx.
So 3*20/3=20

[brittle fjord]

OHH WAIT HOLY SHIT IS IT JUST KVL

Ooooh thanks bro ❤️

[thorny gyro]

It should be

[ancient scarab]

burrito ?

that lenguage doesn't exist

you can maybe go to school

[dreamy spade]

they don't teach there puss in boots language too

if you translate it to English people will help probably

[ancient scarab]

Problem 1-Graph the following vectors using the indicated scale

rest don't need translate

[dreamy spade]

Are these vectors 1D? Why is there only one value for each row? Such thing is named scalar. For the last question I think it's enough to say that Kgf is the force unit (The kilogram-force is equal to the magnitude of the force exerted on one kilogram of mass in a 9.80665 m/s2 gravitational field = 9.80665 N) and N is Newton, also force unit (It is equal to the force that would give a mass of one kilogram an acceleration of one metre per second per second)

So if these vectors are 1D and we can only speak about their magnitude without knowing their direction, the only thing we can say is that the length of 1st vector should be 140/70=2 cm; 2nd vector should be 120/40=3 cm; 3rd vector should be 500/100=5 cm and etc

[ancient scarab]

and the direction of the vector ? how i get that ? (and thx for help me)

direction because we use arrows

ahh no

[dreamy spade]

Idk where you can get direction of those vectors, if it's not stated as it should be then just make all these arrows horisontal

[ancient scarab]

magnitude=long

so cm

thank you so much

<33

[dreamy spade]

no problem

[thorny gyro]

[placid cedar]

https://youtu.be/RUp0hjXt7vI

Help

[thorny gyro]

A small rock is thrown vertically upward with a speed of 27.0 m/s
from the edge of the roof of a 31.0-m
-tall building. The rock doesn't hit the building on its way back down and lands in the street below. Ignore air resistance.
What is the speed of the rock just before it hits the street?

[placid cedar]

Need some help guys, just wanna reach the vid for 500 views, (school related project)

[thorny gyro]

Use v^2=u^2+2as
Put u=27m/s
a=-9.8m/s
s=-31.0m/s
And you should get v^2, then square root.

tyyyy

[thorny gyro]

An object is moving along the x-axis. At t= 0 it is at x= 0. Its x-component of velocity vx as a function of time is given by vx(t)=αt−βt3, where α=7.6 m/s2 and β=3.2 m/s4. At what nonzero time t is the object again at x= 0?

[dreamy spade]

what

[dreamy spade]

I think you are not familiar with integrating but I am strongly not sure if there is a way to solve this in other way

[thorny gyro]

no no ik how to integrate

[dreamy spade]

cool

[thorny gyro]

but is it ok if u check my work

?

@dreamy spade

[dreamy spade]

try it

[thorny gyro]

i did

thats why im asking

pls

[dreamy spade]

send it

[thorny gyro]

@dreamy spade

[thorny gyro]

tyy

[dreamy spade]

you did the same what I did

[thorny gyro]

ok ok tysm

[dreamy spade]

but you should mention that c=0 or don't even use it because integral is definite

[thorny gyro]

yes good point

[dreamy spade]

it's a matter of aesthetics

[thorny gyro]

yes when u do definite integral dont use c...i will also advise to not use c in simple physics integration

[fathom warren]

What's the difference between a cell and a battery?
If battery is just consecutive cells stored to convert chemical energy into chemical, then why's battery written on a cell?

[nimble steeple]

Guys can someone explain the IUPAC of this to me?

It's 3methylbut1yne and I don't get how

[nimble steeple]

Guys pls help I have exam tmrw

[brazen locust]

1. find the longest carbon chain that includes both carbons of the triple bond. (butyne)
2. number the longest chain starting at the end closest to the triple bond (so 1, 2, 3, 4 but backwards than in the image) so it will be but1yne, because the triple bond is first
3. then you have to label the substituent, we have methyl group at third, so it will be 3methylbut1yne

[nimble steeple]

So the number is basically reversed in the image right

?

[brazen locust]

Ye

You just have to locate where the triple bond is

[nimble steeple]

Prolly printing mistake

[brazen locust]

and then just put numbers in order from the first carbon with triple bond to the last carbon in chain

[nimble steeple]

Alr thanks

[dreamy spade]

as I know battery consists of cells but I am not sure

[balmy beacon]

hey guys, I have a question. Does anybody know the structure of this molecule?

[dreamy spade]

https://pubchem.ncbi.nlm.nih.gov/compound/4-Methyl-1_4-hexadiene#section=3D-Conformer

[balmy beacon]

thanks!!

[sinful mirage]

Ques is. Of formal charge
In this example of O3 the second or central oxygen atom forms a coordinate bond in which it donates e- to 3rd O . Sir made 7 e- for 3rd O which is wrong i guess should be 6 instead,
also sir included 6 electrons as shared electron when solving for Formal charge of 2nd Oxygen
Shouldn't there be 5 shared electrons ?
Similarly with the other ques of CO , shouldn't there be 5 shared electrons instead of 6

Where did 2- go

[iron rivet]

1 on each rhenium

[pastel vale]

anyone?

done 😼

[south turret]

d

wait holdup sry my bad c

[pastel vale]

yup its c

thanks!

[fair hearth]

Could someone help me with question 13?

[dreamy spade]

4000 J for 1 kg by 2 degrees means you need 2 times less (2000 J) to raise temperature for 1 kg by 1 degree. For 5 kg multiply it by 5

[keen skiff]

should be D

[fair hearth]

Ohhh ahh I was overcomplicating it

Thanks guys :))

[clever raptor]

Yo peeps

Why is it A for this question?

[south turret]

conc h2so4 will form a double bond ig and then h2 ni gives a hydrogenated product

[unique shell]

hello

how do I find absolute uncertainties

[thorny gyro]

hello, i have a chem question: what condition is necessary to prevent silver from oxidising in air?

[thorny gyro]

ok i got it so ignore what’s above

so can anyone help me with 6.4? i managed all of the above but idk what to do whatsoever here

[thorny gyro]

heyo im lookin for your notion notes to literally any subject of yours im tryna collect a big amount of data to make an overview over any subject that is out there and bring it together to a big pool of useful notes.If u feel like u could help me out please dm! PEACE

[dreamy spade]

2. absolute means not relative, in our case 346*2/100=6.92(approximately)=7 g
   the range is obviously [346-7 g;346+7 g]=[339 g;353 g]
   3)4) don't see full text

[viral sorrel]

do you remember the formula to calculate gravitational force?

[umbral girder]

No

[cunning crescent]

It'll probably be easier to help you if you show your answers for the previous questions

Bc you're supposed to use the answers from previous questions to solve it but I'm too lazy to do the whole thing

[thorny gyro]

i get total current is 6sin(100pit)

but answer gives this??

what is desired current?

[south turret]

its asking i, current through 3ohm resistance not the total current in the circuit

[thorny gyro]

I got i not i1

How do I get that

[south turret]

i1 is the total current in the circuit, look at the diagram given

then current divides at the junction in the ratio of 1:2 in 6ohm resistance and 3ohm resistance by applying kirchhoff laws

[ebon vine]

how do i solve this?

[ebon vine]

how do i form the equations

the junction c,
loop a,b,dc,c1,d,e
loop c,c1, d, c

[brittle fjord]

What's analytical method?nodal analysis?

I think nodal will give u 1 eqn but if they ask for system use kcl and kvl. Dm me if ur stuck

[ebon vine]

system of equations for analytical method

im just trying to look for the voltage and current

using kirchhoff's

[dreamy spade]

maybe under phet they mean this https://phet.colorado.edu/en/simulations/circuit-construction-kit-dc-virtual-lab

[dreamy spade]

kirchhoff equations is analytical method. If you solve these equations by matrix then this is matrix calculator method

[brittle fjord]

Ah we called it differently the way I learned it

[hollow lintel]

can somebody help me with chemistry

I have no idea how to approach this question

[ember inlet]

So basically they have given the weight of phosphorous which is 30.98g
all the phosphorous reacts with oxygen giving u some phosphorous oxide
so out of the 71g , 30.98 grams(~31 g) belong to phosphorous and the remaining 71-31 which is 40g belong to oxygen.Since you know molar masses and all that you can use them to do the 2 parts

[novel gyro]

hello. and i can't seem to fully understand the concept of molality and molarity. mind-boggling when solving.

[ember inlet]

What exactly do u not understand tho?

[thorny gyro]

See in simple terms, Molarity is number of moles of the solute in 1L solution and molality is the number of moles of solute in 1kg solution

[final cloak]

anyone have a answer

i thought i would just find centrip acceleration

by doing v^2 / r

[brittle fjord]

why is i1 = i2 here?

[timid forge]

Initial equation of pressure?

[dreamy spade]

I guess because triangle doesn't consume currents

[hot scroll]

did you get an answer for this question yet?

if not i can try to explain it, i need a warmup for my own physics homework

[final cloak]

Yea I used omega^2 * r

[hot scroll]

nice

it took me a second to remember what omega is bc in my physics class we nicknamed it wumbo lol

[dreamy spade]

lmao wumbo

[clever raptor]

Hi, is there anywhere I can find images of botany slides? Like ELBD 028. I found the pdf for the list but there were no images

[humble imp]

1. Use a recursive algorithm to find the kth term of the following string:
   f(n) = f(n-1) + f(n-2) + f(n-3). Explain the complexity of the algorithm.
2. Improve the complexity of the above algorithm using memorization.
3. Implement the QuickSort algorithm for sorting a vector.
4. Calculate the radical of order k of a number with a precision of 3 decimal places using binary search.
5. To find the number of occurrences of a number in a sorted vector, using 2 binary searches.

Is in C

PLEASE HELP!

[strange summit]

someone please explain impedance to me , im thic thanks 🙂

[alpine plaza]

Lol

[noble marsh]

Hello

I've a question in quantum physics

How can I prove that N = aa+ is hermitian ?

.

Can I say that H= N + 1/2 so N is necessarily hermitian too ?

[north jackal]

why dont you ask chat gpt?

[noble marsh]

Need a real explication, chat gpt isn't accurate on those subjects

[dreamy spade]

can anybody recommend a really good physics youtube channel for pupils with all necessary knowledge of school program

[viral sorrel]

with A you mean an operator?

[dreamy spade]

all measurable operators are hermitian to have real eigenvalues with orthogonal eigenfunctions

[zealous leaf]

I don't know the operators stuff, but with linear algebra: N+ = (aa+)+ = (you swap them and then apply hermetian to both. it makes sense if you imagine multiplying matricies) ((a+)+)(a+) = aa+ = N

[strange summit]

Michel van Biezen is really good, he breaks things down and has dedicated videos to different problems.

[gloomy quail]

Guys im getting the worst grades possible in easiest tests ever in physics. My friends are getting 8/10 and im getting 3/10💀 i feel so dumb. Any advice

[strange summit]

Focus on applying information rather than try to commit to memory-PRACTICE!!! practice past papers or homework questions or textbook problems. Start with walk through tutorial questions so you can try to solve it then look at the solution and explanation. Look at YouTube channel such as Michel van Biezen for explanation and problem solutions. Hope this helps! Don't be discouraged by failure!

[thorny epoch]

1st thing don't compare yourself to others not all have the same way of learning
and my advice is to do is solve as much as possible of problems and start with the easiest thing and make it harder over the time and try to solve older exams of your teacher/professor and search if he repeat a chapter that what you will have to focus on (pareto principle)

[dreamy spade]

focus on with what topics you had the problems on the test

[dreamy spade]

looks like he is only solving problems and not consistently goes from topic to topic.
I wonder if there is some channel like this https://m.youtube.com/@pvictor54
but in english, where there are even special playlists for every school topic with initially theory and then experiments and problem solving.

[compact magnet]

guys

is -25K possible degree?

kelvin

[dreamy spade]

it's literally average kinetic energy of molecules

can it be negative?

[compact magnet]

idk can it be?

[dreamy spade]

what part of it can be negative?

[compact magnet]

ohh okey

[dreamy spade]

in US probably it can be negative they measure everything in obamas per hamburger and somehow understand it

[compact magnet]

is 25 celcius equal to 25 kelvin? (i took notes in classroom last week i cannot understand my notes, i wrote something like this but idk whether it is true or not ) @dreamy spade

[dreamy spade]

if it's possible for Celsius to be negative and not possible for Kelvins then they are not the same

25 Celsius equals 298 Kelvins approximately

if you are speaking about absolute temperature

[compact magnet]

thank u very much you are so cooperative

[dreamy spade]

if you are speaking about temperature change, then change in 25 Kelvins is the same as change in 25 Celsius

[compact magnet]

how?

yess i have a problem in pasco

lemme send screenshot

80

in Fahrenheit i found

there only left kelvin

[dreamy spade]

U can see that Celsius = Kelvins - 273.
So changing the temperature in 1 Kelvin is the same as change in 1 Celsius

Fahrenheit is for perverts

[compact magnet]

i didn't get it tho

aslan where are you from? so relevant name

[dreamy spade]

I am currently in russia

[compact magnet]

u are russian?

[dreamy spade]

no

[compact magnet]

azerbaijani?

[dreamy spade]

Celsius = Kelvins - 273
So 20°C are 293 K
and 25°C are 298 K

[compact magnet]

okey

[dreamy spade]

no, nevermind

[compact magnet]

so difference is 5 kelvin

[dreamy spade]

it appears to be the same (5) as for Celsius

[compact magnet]

okey thank u

btw do you know russian?

[dreamy spade]

yea it's my first language

[compact magnet]

аа пон

[dreamy spade]

мда

[compact magnet]

ахахахаххаха

Look at this aslan if u find a spare time

@dreamy spade

[dreamy spade]

at what exactly should I look

[compact magnet]

Tc= 25 etc in box

[dreamy spade]

there is written that difference in Celsius is equal to the difference in Kelvins as you already understood

both are 25 for some certain situation that was discussed in your class probably

[compact magnet]

Mhmmm okayyyy

Got it

Just it's not mandatory stuff is it

Like in quiz and etc. I'll find by my own

[dreamy spade]

idk of it's some quizz or smth

[compact magnet]

Alright thank u:)

[thorny gyro]

How can homologous recombination favor the integration of multiple genes over a single gene into the chromosome?

[whole sky]

Hello anyone here has a recommendation about geography books ? Specially for cultural geography. Or anything may help. Thankys!!

[thorny gyro]

Easy

[woeful talon]

whatt is the physical significance of phi in simple harmonic motions, where x= A sin ( wt + phi) where phi is the initial phase, what is the physical significance of the initial phase

[fluid jacinth]

i believe that the initial phase means that at t=0 the wave has some height

if u search for a graphical interpretation it could help u a lot better

[proper plume]

Check me since i haven't used this stuff since a year or so. So what phi does is it kind of parametrizes your starting position in SHM. Like if you are starting on the y-axis in a phasor diagram your initial phase will be pi/2. So for each starting position on the phasor you have a corresponding value of phi which tells you exactly where you are. And then the phasor diagram is kind of a way to breakdown the wave motion of a particle into a simple diagram which provides you with all the necessary information in one place.

[quick rapids]

can someone help me

idk why its A

[dreamy spade]

bcs collision is elastic that means not only total momentum conserves, but also total energy doesn't disappear via friction or bending. The only way for similar bodies to satisfy both equations:
(For total momentum) m1v1+m2v2(before)=(after)m1v1+m2v2
(For total energy)
m1v1^2/2+m2v2^2/2(before)=(after)m1v1^2/2+m2v2^2/2
Is to just swap their velocites

[grand lotus]

can someone please help me with this?

[dreamy spade]

looks like correct answer. He measured distance two times (point P and point Q) and their uncertainty adds, so paercentage = abs/value = 0.4/50.9

[grand lotus]

thank you

[dreamy spade]

anybody knows what is tr_2?

update from developers of just trace or what

[cold forum]

hi guys any advice on how to memorize kation and anions overnight

i have finals tommorow

[knotty meadow]

Where is it used?

[dreamy spade]

if it helps (it won't), then problem 7.3 for R-matrix and Lax pairs

P_12 just permutates elements in tensor product
https://www.slac.stanford.edu/econf/C0709107/pdf/317.pdf

[knotty meadow]

🥲

[dreamy spade]

same

[knotty meadow]

I would like to understand the purpose of designing this question

why????

[dreamy spade]

my question?

maybe trace_2 is something known for everybody except me

[knotty meadow]

you are not alone😂

[dreamy spade]

like avatar 2

or minecraft 2

[knotty meadow]

But I think I can solve it with the help of coding

[dreamy spade]

how u can code smth if u can't understand the question

I asked my teacher already via mail but embarassed bcs I should know this probably

[errant hazel]

hello! did anyone here study neuroscience?? I would like to ask some question about it

[knotty meadow]

You can understand the basic concepts with the available documents and understand them step by step. In questions that I don't understand, I try to understand myself with code language

[dreamy spade]

you'll amaze me if u do smth like this

[knotty meadow]

The document available on the internet is more useful for me than the professor😂

[keen field]

Hey, this is an emergency, does someone know how we call this molecule ? I only need its name

[barren furnace]

Hey, I dunno if it helps, but my friend mentions it's an ester formed by a 2-hydroxyl phenyl acetic acid and a 3-hydroxyl butyrate

the name i'm not that sure

[keen field]

Thanks for your help, I synthetize this molecule from ethyl 3 hydroxybutyrate by an esterification of Stelgich. So for the hydroxybutyrate I'm sure. But if someone know the exact name it'll be amazing

[crystal barn]

This statement is false ryt?

[dreamy spade]

obviously if it is true somebody just for trolling would make infinitely big charge to destroy our planet

[crystal barn]

Ikr I asked because in the book ans is true lol

[dreamy spade]

I was wrong in a some way, we can build electron detectors using scintillators (some sort of photoelectric effect), while one fast high energy electron hits detector it takes more than one electron from the metal surface, that can be accelerated by high voltage and knock out even more electrons causing a chain reactions that is used in radiation detectors for example
https://en.wikipedia.org/wiki/Photomultiplier_tube

[crystal barn]

i guess my book was not wrong then 😂

[dreamy spade]

but formulation there is very weird

[arctic sapphire]

I am doing qualitative analysis in chem lab and i have a double salt with Co2+, NH4 2+ and SO4 2-
How do i write the formula for it?

[prisma prism]

How do I identify pseudohalides?

[undone palm]

Anyone up for Neet studies??

[thorny gyro]

is anyone here rlly good at mechanics

i need like 15 mins of ur time for some qs help

[dreamy spade]

what do you need

@thorny gyro

[thorny gyro]

Could someone clarify upto what point exactly is elastic force conservative ? internet shows it's valid upto wherever hooke's law is valid , by that logic it should be upto proportional point. But I kinda remember studying.....isn't it conservative upto elastic limit ?

[thorny gyro]

Co(nh4)2(so4)2

[wispy musk]

hey

i need help

getting a pdf TT LOL

https://journals.lww.com/jrnldbp/Abstract/2009/10000/Autism_Spectrum_Disorders_in_Infancy_and.15.aspx

can someone get this for me TT

[gentle scarab]

yes

[gentle scarab]

they generally have a Carbon and Nitrogen atom in them and they are not many so you can remember them easily there are some exceptions like azide ion which dont have carbon in it but is a pseudohalide.

[gentle scarab]

it is conservative upto elastic limit or proportionality point i think beyond that it is not conservative in nature.

[thorny gyro]

thanks!

[prisma prism]

Thanks 🙆

[woeful talon]

FLUIDS DYNAMICS, in capillarity where the capillary tube is made up of 2 different materials, will the liquid EVER flow into the second material or it will just keep adjusting the radius of curvature of the first material, what will happen if radius of curvature is maximized for the first material?

ps: this is a type of question based on this, I DONT WANT THIS QUESTION's SOLUTION, just the concept is applied here in option 2, THANKYOU.

[glossy briar]

how would i go about balancing this

H2 + Ca(CN)2 + NaAlF4 + FeSO4 + MgSiO3 + KI + H3PO4 + PbCrO4 + H3PO4 +
PbCrO4 + BrCl + CF2Cl2 + SO2 =
PbBr2 + CrCl3 + MgCO3 + KAl(OH)4 + Fe(SCN)3 + Pl3 + Na2SiO3 + CaF2 + H2O

[arctic sapphire]

thank you!! ^^

[dreamy spade]

H2 + Ca(CN)2 + NaAlF4 + FeSO4 + MgSiO3 + KI + 2H3PO4 + 2PbCrO4 + BrCl + CF2Cl2 + SO2 = PbBr2 + 3CrCl3 + MgCO3 + KAl(OH)4 + Fe(SCN)3 + 3PbI2 + Na2SiO3 + CaF2 + 4H2O

[gentle scarab]

i think the radius will just adjust and the water should not go in the 2nd capillary in case 2 but i am also not sure abt this.

I saw a ques which might help you

[glossy briar]

H, N, and O are still unbalanced

[dreamy spade]

sorry I just copied it from AI

try this
https://www.webqc.org/balance.php

[cedar island]

Can someone please help me with part b

[dreamy spade]

F_{horizontal}-F_{friction}=mass×acceleration
Initially acceleration was 0 so we can find F_{friction}=F_{horizontal}=P×cos(40)
From the other side F_{friction}=k×F_{vertical}=k×(P×sin(40)+mg), so k(friction coefficient)=F_{horizontal}/F_{vertical}=P×cos(40)/(P×sin(40)+mg) (calculate it yourself I am lazy)

Then we change P, let's say now it's P', so friction also will change:
F_{horizontal}-F_{friction}=mass×acceleration=18kg×1.2 ms^{-1}/2 s
from the other side F_{friction}=k×F_{vertical}=k×(P'×sin(40)+mg) so
P'cos(40)-k×(P'×sin(40)+mg)=mass×acceleration=18kg×1.2 ms^{-1}/2 s
or
P'(cos(40)-k×sin(40))=mass×acceleration+k×mg
therefore
P'=(mass×acceleration+k×mg)/(cos(40)-k×sin(40))

[grand lotus]

does anybody have good source to learn about a level electricity, I really struggle with the questions, thanks

[thorny gyro]

Ask to chatgpt

[umbral girder]

No

[thorny gyro]

whateverr

[thorny gyro]

lmfao

[ebon canopy]

1. If I have a white water bottle and a black water bottle, which will keep my water cold longer? Why?

2. How does color influence insulated products like reusable water bottles and tupperware?

[dreamy pelican]

a white water bottle will keep the water cold for a longer period of time because black and other dark colors tend to absorb heat.

[thorny gyro]

well for the 2nd question i don't think colors affect much as they are transparent anywas, but generally dark colours absorb more heat

[snow meadow]

yuck physics

[dreamy spade]

https://tenor.com/view/iovefromagirl-gif-23245074

[grand lotus]

for part b, im not sure why they resolved 19g by sin23 insteadd of cos23, is it the fact the blocks do not slip at any time on the belt?

[grand lotus]

thank you, just forgot how basic trig worked 🙂

[gentle gulch]

Why are you even considering vertical component of P? Horizontal component is what helping in motion.
You can't equate Friction with Vertical component of Applied force (P). There is no relation between them. Friction always act along the surface. Be it static or kinetic friction.

[dreamy spade]

friction depends on the force you press your body to the surface. You can remember situations where you unintentionally press stuff to the surfaces stronger to increase friction. Friction is proportional (in the simplest model) to the vertical forces with some coefficient k

that's where vertical components of forces appear

[gentle gulch]

Oh yeaaaaa

kinetic friction depends on Normal force

which is a vertical force

I mean it's always perpendicular to the surface

[velvet cobalt]

Est-ce que peut quelqu’un peut m’aider sur ça?

J’essaye d’apprendre ce sujet moi-même et je ne peux pas pu trouver les répondes en français…

[dreamy spade]

can you at least make an effort a bit to translate your question to be understandable for people that want to help you?

[past dew]

can someone help me with integration

[dreamy spade]

depends on what you integrate

[gentle gulch]

people can only if you post a picture and ask question. None here can do telekenesis

[thorny epoch]

he asked if someone could help him and that he tried to learn the subject but he can't find answers in french

[dreamy spade]

no u can translate the assignment also

[south turret]

1. endothermic
2. 200kJ
3. 300kJ
4. 400kJ
5. 100kJ

this will help you a little bit

[velvet cobalt]

Thank you so much @south turret

[velvet cobalt]

French is not my first language. I studied the subjet in my mother tongue but had hard time to translate or find the correct answers in French. This is why I asked it in that way mate

[woeful talon]

what will be the bond angle in drago compounds? do all atoms lie in 1 plane?

[stone tangle]

can someone helpp me get the equivalent resistance heree? I appreciate the helpp

[dreamy spade]

you can bend your wires in a way to make your circuit simpler

and then just calculate resistance for parallel and consistent connection

[stone tangle]

Thank you

[supple plover]

How many grams of O is contained in
69.1 g of K2CO3?
A. 24.0 g
B. 36.0 g
C. 12.0 g

It would be A right? just want to confirm

[thorny gyro]

A is the correct answer

[supple plover]

Appreciate that 🫡

[thin shoal]

Can someone please help me to this question until find the output equation? thankss

[dreamy spade]

consider currents and voltages here as complex vectors

as always they are connected to each other by Ohm law

but capacitor and coil have complex resistances, u can google them

so just write kirhgof equations for this circuit

[thin shoal]

aaa I see. okayy thank youu!!

[glacial island]

Based on the data in this graph, which of the following methods would be used to calculate the percent change of wind energy generated from 2010 to 2015?

[dreamy spade]

b is correct

change is ending result - initial result=200-100

and then u need to divide over initial result and multiply by 100 to get percents

[glacial island]

Thank you so much!

[odd folio]

Hello I need help understanding this Electrical Circuit

[odd folio]

From what I understand, in the Left Inside Loop, The Voltage Rises with 50V and is equal to the Voltage Drop 5(I1) + 20(I3) .
Because the Left Inside Loop is clockwise?
- to +?
50V is equal to the resistance of 5 Ohms * I1?

and for the Right Inside Loop, The Voltage Rise is 30V + 10 (I2) + 20 (I3) and is equal to The Voltage Drop 0
but why? because counter clockwise?

[dreamy spade]

yeah because that

it's a bit dumb approach never seen like that

u just go (while holding a charge) in the chosen direction (clockwise) and measure if you make positive work or negative on each element

and those weirdos put positive in one column and negative in another

[odd folio]

i think it's because the idea is that it's using Linear Algebra to find the currents in the circuit,using Matrices to find the Currents.

[dreamy spade]

I don't see here any linear algebra

but later maybe they use matrices

[odd folio]

yeah I know how solve for the Current using matrices and it looks correct, but my problem now is "how to read electrical circuit and write the equations"

[odd folio]

Why the Right Inside Loop has the
Voltage Rises: 30 + 10(I2) + 20(I3)
Voltage Drop: 0
why is that?
why isn't it
Voltage Rises: 30
Voltage Drop: 10(I2) + 20(I3)

[dreamy spade]

bro imagine u hold the charge in ur hands like heavy rock

if u carry it against the current u r going against field direction

u r making positive work

to bring ur charge on the top of energy mountain

that's why it's voltage rise not drop

that's why it's important which direction u are going, against current or alongside it

[odd folio]

Question
should The Right Inside Loop be:
0(I1) - 2(I2) + 4(I3) = 8
instead of
0(I1) + 2(I2) + 4(I3) = 8

because I1 also share the 2 resistor and the I1 current is opposing the I2 current?

[dreamy spade]

I1 isn't related in any way to right loop. There are only currents I2 and I3. Let's assume we will walk clockwise on this loop and check what work we are doing to carry a charge:
work=I3×4Ohms+I2×2Ohms-8V=0
in total the work should be zero because we returned the charge to the point where we got it (charge should return on the same "energy height"). We took 8V with negative sign because jumping from + side to - side (from higher potential/ higher height to lower) obviously gave us energy instead of requiring work.

[warped glacier]

if anyone is good at NMR im struggling to piece my unknown together. i know that there is a C=O, C-O, and C-H group but i cant figure it out i have also attached the H nmr spectra, c nmr, apt, and ir

[lavish plinth]

Can someone please help me with part b

[blazing imp]

I need help with this Fluorescence analysis and Liquid Liquid separation (Chem related) Question

[woeful talon]

do insulators also transfer electrons? if yes then what is the simple difference between conductors and insulators both by definitive way and practical way if insulators also transfer e-

[potent dagger]

Can any1 help me with this Redox question pls

How do I calculate the ratio between the two metals?

[dreamy spade]

Insulator is a type of material, it doesn't conduct electricity but because everything in our life isn't perfect, insulators conduct electricity but very badly. Conductors by definition conduct electricity but much better than insulators. The difference is quantitative and very big.

[lavish plinth]

thank youu!

:))

[restive grotto]

Insulators or bad conductors don’t have as many free electrons as good conductors. Their atoms have tightly bound electrons which limits the flow of electricity as the electrons cannot travel from one atom to the other

A conductor on the other hand, has free electrons and very little resistance, so, when a battery is connected, electricity flows through the conductor with very little resistance i.e. the electrons can move from one atom to the other easily

[drifting pollen]

Anyone knows how to determine the direction of friction in a circular motion?
say in this picture, the car is moving to the left, and friction is acting to the left too. Why is that so?

[dreamy spade]

this is very bad picture

here u can see that if the car is moving on the right, the wheel need to slide to the left at the point of contact with the earth. Friction acts against relative motion at the contact point, so friction will be also directed to the right side and will help car to move. That's why it's so important for vehicles to have good friction with the ground, or instead wheel would slip

[drifting pollen]

Thank you so much!

[woeful talon]

why here (iii) will be highest?

also also also among b and c, which will be more stable and why

[south turret]

because of resonance with no2 group ig

which would make it more stable as compared to others

[south turret]

is b more stable?

[woeful talon]

c

[south turret]

well i mean its based on +I effect of ethyl groups in b and methyl+propyl group in c

idk which one has a greater +I effect tho

[woeful talon]

answer should be only (ii) right? cuz other structures are not possible due to bredt's rule

[south turret]

wtf is bredt's rule lol

never read that in my jee prep

anyways they all can exhibit tautomerism

one or the other alpha carbon has a free hydrogen so a double bond is possible

[woeful talon]

lol which class

[south turret]

12th

over

[silver jay]

Anyone suggest me a good video to understand mole concept

[thorny gyro]

how
how do you identify if a combustion if complete or incomplete? Im asked to predict the products but i dont even know if its complete or incomplete combustion

HEEEELP

[prisma spear]

its complete if all of the oxygen is burnout

the campbell biology is a pretty good book. u can find a pdf online i recommend it

[thorny gyro]

i dont know what you mean'

[prisma spear]

like if u have enough oxygen to complete the reaction, all of it will be used

[thorny gyro]

can you show illustrations

2 examples of compelte and incomplete

[prisma spear]

i just googled it now. i dont see this topic in a long time

[thorny gyro]

doesnt make sense. they have same reactants

and the incompelte one is missing one product which is the carbon(s)

[prisma spear]

but its not about the reactants its about the product

[thorny gyro]

but how do you know those are the products???

you cant just guess

😭

[prisma spear]

can u show your problem?

u need enough information

[thorny gyro]

C2H5OH + O2 -->

C2H5OH + O2 -->

apparently first one is comeplte and second is incomplete

[prisma spear]

the question says that?

[thorny gyro]

yes well it definitely wont say in the quiz so

im just tryna figure out how

[prisma spear]

so if it is complete, u know that all of the oxygen its used

[thorny gyro]

its driving me CrAzYYYY

[prisma spear]

u cant know just with the reactions the question must say it

[thorny gyro]

but WHAT IF theres no 'instructions' saing what type of combustion they are

[thorny gyro]

i dont think my teacher is tha lenient

[prisma spear]

than u dont do it

[thorny gyro]

😭

[prisma spear]

it’s literally impossible my dude just chill

your professor will provide u with enough information

[thorny gyro]

thats why i ahte his class

[thorny gyro]

he aint a prof

lmao

he prolly wishes to be

but ok

@prisma spear
also is this correct
CuCl2 + 2KOH --> Cu(OH)2 + 2KCl

isnt this neutrlization since theres OH as reactant and hence its a base so it should yield water + salt

[prisma spear]

the equation is correct

idk bro i study cinema
but im pretty sure that’s and ionic thing and u have to have acid + base to have a neutralization

CuCl2 is not an acid

[thorny gyro]

ok

[prisma spear]

try some youtube videos about the basics i think u are kinda confused about all the terminology and fuck chemistry
it should be easier to do the questions later

[mystic barn]

can someone help me with this question ASAP!!😭😭

[royal dagger]

Bredt's rule isn't applicable here!! It's only applicable on bridged bicyclic right while this is just a fused bicyclic cmpd. (2C directly connected)
Moreover there's no strain at the bhc

[woeful talon]

thank you YOU, didnt expect you to answer haha, THANKS!!!

[royal dagger]

Haha hope that helped

Saw ur text wen I wanted to get a dbt cleared out but ppl on telegram helped me with it already :))

[royal maple]

any tips on memorizing the periodic table?

[solemn cave]

learn it like it's a song

[spring mauve]

hello!! this is probs v simple and I'm just not getting it but I'm doing a level chemistry and currently revising aldehydes/ketones.. its basically the reactions with cyanides ions.. is anyone able to explain to me how the product can go from a hydroxy nitrile to an amino acid😭 why is there chlorine idk man it just isn't clicking rn

[sinful mirage]

??????????????????????????????????

[spring mauve]

apparently so.. whats the question

[sinful mirage]

i got the answer

[spring mauve]

lavley

[south turret]

are you talking about cyanohydrin?

[spring mauve]

this is what it says in my notes and i just don’t get how that happens.. theres a question below that asks how 2-hydroxypropanoic acid can be synthesised from ethanol and im assuming its the same way as the example above but i dont get how the example even works

[south turret]

those are ig substitution reactions and conversion of nitrile to carboxylic group

and for the conversion ig you have to make ethanal from ethanol first by PCC or CrO3 then you can add HCN to make the hydroxynitrile compound and then its the same as given in the example

[spring mauve]

ok kinda makes sense thank u!

[thorny gyro]

I had a question its kinda based on chemistry but has a lot to do with math as well

Q1. Someone gifted me 1 mol rupees ( currency ). Where according to avogadros number 1 mol is 6.022 * 10 raised to 23. I spend 100,000 rupees per second. How many Years can i spent this amount of money for. Compare this year to the relative age of the earth.

Its hella confusing a quick answer would be very helpful. Also uploaded on maths channed as its kina revolving around maths as well Thank you.

for more context this is earths age in numbers 4534000000 ( also as an assumption as calculation with real age is madness and too complicated )

I got some ridiculous answer and i believe its wrong its (115.50 * 10 raised to 4 times current age of earth is the amount of time will be the amount of time i will be able to spend the money for)

[lavish obsidian]

I got the answer around 42 years acc to age of earth that u mentioned

[thorny gyro]

Ok so mine is pretty wrong can you send a picture of the solution that will be very helpful

[dreamy spade]

it's definitely incorrect, the answer should be unimaginably big like the one Dwij called ridiculous

[lavish obsidian]

Idk I just did it with calculator so ..

[lavish obsidian]

I really don't know if calculator can be incorrect

[thorny gyro]

Ok

[lavish obsidian]

Took 100k multiplied it with 60 2 times to get money spent in hours

[thorny gyro]

How did you calculate the seconds i did like first devised the amount of money divided by seconds

[lavish obsidian]

Then multiplied it with 24 to get it in a day and then 365 for money spent in 1 year

[lavish obsidian]

It is per second

[thorny gyro]

Ya

[dreamy spade]

In really don't know how can you divide the number with 23 zeros over number with 5 zeros and get smth not with 18 zeros

[lavish obsidian]

So like 100k in 1 second and 6000k in 1 minute

And then 360000k in 1 hour

Which is 3.6×10^7

[lavish obsidian]

You need to find it in years first

[lavish obsidian]

Multiply it with 24 and 365

[thorny gyro]

I will do the calculations once again and give a photo

[lavish obsidian]

That will be amount of money spent in 1 year

And it's quiet a lot

[dreamy spade]

there are 31 million of seconds in year, so number with 18 zeros I have to additionally divide over number with 6 zeros and get smth with 12 zeros

[lavish obsidian]

Idk man I just did simple calculative maths lol

[thorny gyro]

See I did the calculations by hand as the exams I am preparing for has no calculators

So mine might have been wrong

[lavish obsidian]

Ohh I'll have to eat I'll try to do it by hand again

Or I'll send ss maybe

[thorny gyro]

Ok thank you for the help

Not necessary man you already game me an outcome so I will try to get that too

[lavish obsidian]

@dreamy spade @thorny gyro

It's 10²²

So 42 was right

[dreamy spade]

oh okay so big number appeared not to be so big as it seems

sowwy:3 then

[thorny gyro]

Ya man it’s such a stupid question according to me

So time consuming for a 3 hours long exam

Hopefully this type is not covered as without calculators it’s really a nightmare

[lavish obsidian]

It's alright

[lavish obsidian]

It definitely is

[lavish obsidian]

You giving jee/neet or smth

[thorny gyro]

Jee

[golden kestrel]

Does anyone know the value of the apparent speed of rotation of the sun ?

[wanton aurora]

Hope this helps

[golden kestrel]

Thx a lot idk y but in french i dont find those answers

[thorny gyro]

Thank you

[distant tulip]

Can anyone tell me which side has the more number of moles? I'm confused cause it's a balanced equation

[dreamy spade]

the mole is just a unit to measure big amounts. For example when you are at store, you don't buy nuts one by one, you buy it in cups for example. The same is for mole, it's a cup, containing 6*10^23 molecules. In your reaction one molecule of N2 reacts with 3 molecules of H2 and 2 molecules of NH3 appear. If we scale this to our "cups", that means we need one mole of N2 and 3 moles of H2 to get 2 moles of NH3

[distant tulip]

So if the pressure shifts to the side with the less number of moles that means it shifts to the right, right?

An increase in pressure= shift to right
Decrease is opposite

?

[dreamy spade]

it's hard to say because pressure depends not only on concentration, but also on temperature (p=nkT). If reaction shifts to the right, then concentration of molecules decreases, but temperature can rise because reaction is exothermic so I can't clearly say what will happen with pressure

[tender sinew]

but if we externally apply pressure ie more pressure the reaction will favour forward, ryt? because the Ng is more in left hand side than right according to le chatelier's principle

[thorny gyro]

Woah this explanation was good I only knew the technical terms but thanks for the brief explanation

[dreamy spade]

if you do it under certain temperature then definitely yes

[tender sinew]

Ah yes under constant temperature

[thorny gyro]

heyy!! is someone good at organic chemistry there?

[tender sinew]

whats the question?

[lime gate]

Could someone explain why this is incorrect? I'm struggling with chem😭

[tender sinew]

its dimethyl not nly methyl

[lime gate]

Oh... is that because there's one in 3 and 5 so two branches?

[tender sinew]

there are two methyl grps so u call it dimethyl

if there are three its called trimethyl and so on

[lime gate]

aha.. thank you so much😭 I'm so sorry but do you also know how to solve for these too?

[tender sinew]

k wait

the second one diagram is not clear

the second one if there are nly 4 carbon atoms it shud be called 2 methyl propane

[lime gate]

Ohhhhhhh Thaaaaank youuuuu......... You're my savior!!!!

[lime gate]

Sorry to keep bothering you🥺 how do we know it's 4-methylheptane without any graph?

[tender sinew]

i drew the chain in the pic ryt

also whats a graph

[lime gate]

Oh yea I mean the chain! How were you able to draw it just looking at the information that 2-propylpentane is an incorrect IUPAC name?🤔

[tender sinew]

pentane is a 5 carbon chain and propyl grp is in the second carbon of pentane

draw it

[lime gate]

AHHHHH now I see!! So it's like rewriting the name
Thank you thank you I'm clear now/🙆‍♀️

[tender sinew]

yup just practise it will become easy

[thorny gyro]

@dreamy spade @lavish obsidian @wanton aurora The teacher got this as the answer its confusing so i will give up on this question thank you for your help

[shadow adder]

can someone help w this

why is the answer not just D considering the mass will execute projectile motion after the string is cut off

and for maximum range the angle must be 45 degrees

[lavish obsidian]

That's wrong to apply here what you have to do is find the value of horizontal distance travelled i.e. (range) in terms of theta and then find the value of theta in which case range will be maximum

You can do that by applying energy conservation at that point P and hence find velocity and then range can be found by simple projectile motion

[shadow adder]

oh right

alright i'll try again thank you!

[thorny gyro]

https://forms.gle/xDVkfQrwT2kvReQw7
heyy guys i need to collect many responses
for my project
its abt general fitness plssssssssss fill it

[thorny gyro]

is someone good at saponification ?

[radiant yoke]

Can anyone help me w electronic configuration

[dreamy spade]

just post your question

[radiant yoke]

No.92

I can't get how it is happening

[dreamy spade]

S level has maximum 2 electrons, P level has 6 electrons, D level can have 10 electrons and F level can have 14 electrons. So the last level of that element have to be F (some heavy element) and also 4 electrons (negative particles) should be added. Looks like the answer is (b)

But I'm not sure lemme check that

[thorny gyro]

so if it loses 1 e it will have 18 e in the outermost shell

[radiant yoke]

Thank u so much

Could you please tell me how to find out the number of electrons in the shell, if the electronic configuration is given in terms of subshell.

[radiant yoke]

For example thorium

[thorny gyro]

add up the numbers in the superscript of the subshells

[frigid night]

Hi is anyone able to help me with some physics?

I’m a little stuck on a kinematics problem

[dreamy spade]

post this problem

[frigid night]

Ah it’s alright, I managed to figure it out on my own, thank you though :)

[thorny gyro]

https://byjus.com/question-answer/c-6h-5-underset-oh-underset-c-h-ch-ch-2-hbr-to-major-product/
Why is Br- added to the Primary carbocation and not the secondary carbocation?

[rose tinsel]

C6H5 OH|CH CH=CH2+HBr

Because of the presence of an adjacent electron-donating group like the phenol group. A primary carbocations will be more stable than secondary carbocations.

[thorny gyro]

is my reasoning correct?
If Br adds to secondary carbocation, alpha Hydrogen is 1
and if Br adds to primary carbocation, alpha Hydrogen is 2
so according to Saytzeff rule more stable alkene will be when Br adds to primary carbocation

[rose tinsel]

partially correct, but the conclusion drawn from it may not always be true.

I will explain it in a moment

[thorny gyro]

okay better dm me

[split flax]

How studied astronomy before?

Any ideas and tips

[rose tinsel]

The preference for Br- addition to primary or secondary carbocation is also influenced by other factors, such as the stability of the carbocation intermediate and the nature of the attacking nucleophile.

For example, in the case of HBr addition to an alkene, Br- is a stronger nucleophile than H2O, and therefore, it can attack a primary carbocation more easily than a secondary carbocation.

Another classic example would be the reaction between 2-butene and HBr, the more stable product is 2-bromobutane

@thorny gyro

[thorny gyro]

thats saytzeff

[rose tinsel]

Let me rephrase

[thorny gyro]

thanks for tryin tho...I think my teacher can clear that out

[rose tinsel]

Simple way of saying is Saytzeff rule is not applicable to all reactions involving alkenes.

https://unacademy.com/content/upsc/study-material/chemistry/saytzeffs-rule/

https://www.chemtube3d.com/rad-additionofhbrtoisobutene/

[olive warren]

help me understand why, in chemical equations we write atoms with a subscript of 2 or more and other times we dont
i.e,
Na2+Cl2 -> 2NaCl
Ca+Cl2 -> CaCl2

[viral sorrel]

they aren't atoms, they are molecules formed by 2 atoms, which how the element is commonly found in nature

you don't have O atoms flying around, but you surely have O2 molecules all over the place

[olive warren]

how would i know which elements are like that and which arent

[olive warren]

i see

[viral sorrel]

generally gasses are like that

but don't worry too much about it

[olive warren]

pfft this was funny

[olive warren]

it becomes critical when balancing redox reactions

[viral sorrel]

when you're balacing reactions you are already given if the element is in pairs of 2 or single

[olive warren]

right so, during redox reactions do i treat a radical like how i would treat an atom in compound?
like if the oxidation no of an atom changes i show that during half reduction/oxidation
but if oxidation no of a radical changes do i show the entire radical or the atom whose oxidation no changed?

[olive warren]

thats if they give the reactions, sometimes they just say x element reactions with y element and show half oxidation and reduction

[thorny gyro]

https://byjus.com/question-answer/the-major-product-obtained-from-e2-elimination-of-3-bromo-2-fluoropentane-is/
I did A but my tuition teaher said D...who did a mistake?

[lime gate]

Could anyone help me naming these?🥹

[south turret]

1. but-2-yne
2. cyclopentanol
3. 1-chloro-3-methylbut-1-ene
4. benzene
5. (i suppose those lines just represent the carbon bonded to hydrogen atoms) 3-methylhex-3-ene

[lime gate]

thank you...😭

[shadow adder]

could i get some help with this one

[quick flame]

Im not sure if i understand the logic behind this q, can someone help me with that?

[distant prism]

in a system like this (the container on the right side is empty) when the faucet on the right is opened, the vapor pressure does not change but the amount of H2O gas molecules increases. how does that happen? i'd appreciate it if you could help, thank you

[thorny gyro]

One message removed from a suspended account.

[twin grotto]

send

[thorny gyro]

One message removed from a suspended account.

One message removed from a suspended account.

One message removed from a suspended account.

One message removed from a suspended account.

[twin grotto]

i thought so too but apparently not

its beyond the scope of the syllabus to actually understand how they function so dont worry about it

[twin grotto]

but you can just look it up if you want, all you should know is this

[thorny gyro]

One message removed from a suspended account.

[thorny gyro]

One message removed from a suspended account.

One message removed from a suspended account.

[twin grotto]

when the resistance is high the lamp gets more voltage

yeah that def confused me too its very unintuitive

[thorny gyro]

One message removed from a suspended account.

[twin grotto]

np broski

[thorny gyro]

How many maximum atoms lie in the same plane in toluene?

[south turret]

13 ig

[thorny gyro]

yes thats the ans ..can u explain how one of the hydrogen of Ch3 group also lies in plane?it should be out of plane as Ch3 is tetrahedral

[south turret]

because of tetrahedral geometry

like

wait

you see the hydrogen on the left and top lie in the same plane

the other two wont

like this you can take more pairs where 2 hydrogen lie on same plane and the other two wont

[thorny gyro]

Thanks for the help...keep it up

[lime gate]

In chemistry, sometimes they have R group
Could it be any random group? bc R group is different for everytime🤔

[thorny gyro]

R group signifies alkyl group

[dreamy spade]

bro doesn't even ask anything or say please, he just puts his problem statement into automatic solving machine

[dreamy spade]

don't forget to check if I've mistaken

[lime gate]

thank you!!

[eager atlas]

i can’t figure out why the Kc doesn’t change when pressure is increased

[civic nebula]

Um sorry
I was studying at that particular time
So I just shared the question
I thought it was obvious that it was a doubt for me

I should have said please
my bad

[civic nebula]

I can't understand this fully
Can you please explain a Lil bit what you did in 1 and 2?
And what does the O symbol and Ō symbol means?
What does a dot above s bracket denotes?

And the answer given is 0.01

But I am still interested in the method

[dreamy spade]

Q is charge, dot means time derivative

[civic nebula]

Oh ok

[dreamy spade]

how to write kirhgoff equation for this system?

U=CQ+IR isn't it?

[civic nebula]

Yes

[dreamy spade]

we can write current like time derivative of charge on capacitor

so we are getting differential equation for charge in capacitor
U=QC+dot(Q)R

and then I just solve it independetly for t and t^2 bcs equation is linear and solutions for t and t^2 in total would give a solution for t+t^2

[civic nebula]

Oh
I see
This is a new method for me

[dreamy spade]

i don't know if it's correct I just invented this method

[civic nebula]

I am trying to understand this
I need sometime

But thanks for the help!
I appreciate it

[dreamy spade]

you can ask if you don't understand

[civic nebula]

Okay :)

[lime gate]

Hi! I have a question about alkynes. How do we know the angle of the line structure? For example, I understand that 2 to 5 is straight because it is alkynes, but for 5, why is it going down not up? Or does it not matter?

[south turret]

doesnt really matter, it only matters when there is a chiral compound/stereochemistry involved

[lime gate]

thank you!!

[thorny gyro]

current just after closing the switch. Would it be 2 A ?

[dreamy spade]

coil can't instantly allow current to flow through it, so it will be just two 5 ohm resistors (10 in total). Then use Ohm law to find current

[thorny gyro]

so, since one 5 ohm resistor is connected in parallel, the inductor will have no effect on it?

[dreamy spade]

coil can't conduct current at this moment, just imagine that it doesn't exist lol

[thorny gyro]

and if the cuurent was flowing for a long time, then how will it be calculated?

[dreamy spade]

for a long time current will stabilize on coil. It means voltage on coil will become zero and now nothing will flow through parallel resistor. You can imagine that parallel resistor doesn't exist. For not a long and not instant time you have to solve differential equation

[thorny gyro]

ooh... thanks, these circuits have been bothering me for a while now

[dreamy spade]

if parallel resistor doesn't exist and coil doesn't take voltage anymore total current will be 10V/5ohms=2 Ampers

[thorny gyro]

thanks again

[shadow adder]

could i get some help with this one?

[south turret]

13?

[shadow adder]

i didnt get that

could you explain just the first 2 steps

[south turret]

the springs are in a series combination and effective spring constant would be 3k/4 then we can assume it as a single spring then just using the equation F=ma=-3kx/4 , a=-(3k/4m)x
we'll get angular freq = root(3k/4m)

[shadow adder]

they are in parallel though..

series would imply them both being connected successively

[dreamy spade]

they are not in parallel, they are in series

[shadow adder]

how

they arent directly connected

[dreamy spade]

they are literally connected

[thorny gyro]

Can someone explain this? Acc to me, it should be pi sqrt m/k but i just put the values in the formula. Is there anything else to do in the question?

[shadow adder]

thats not how series works bruh

[dreamy spade]

that's how they work

[shadow adder]

series is literally one after the other

not one beside the other

[dreamy spade]

it's litteraly one after another

[shadow adder]

.

both springs have the same start point and same end point

[dreamy spade]

they don't have the same start point

[shadow adder]

thats how a parallel connection works

the pulley

[dreamy spade]

it can rotate

[shadow adder]

if it were series wouldnt the springs be one below the other

[dreamy spade]

it's one below the other

[shadow adder]

i feel like im not visualising it right

[dreamy spade]

don't just look for analogies in the pictures

think what makes series connection series

in series connection forces of springs are equal and deformation adds

in parallel connection forces of springs add and deformation is equal

I hope you see that in your case one spring have the same force as the second one because they are connected by a rope

and also because of this rope their deformation will add

[shadow adder]

right

i think i get it

thank you!

[civic nebula]

Can someone help me with finding moment of inertia around axis 3 pls?

I already have find out the moment of inertia around axis 1 and 2
Which are
Axis 1 - 2MR²/5
Axis 2 - 83MR²/320

I know theorem of perpendicular or parallel axis will be used

But idk how

[torn briar]

Hello if instantaneous velocity is upward, does that necessarily mean speed of elevator is increasing?

[civic nebula]

Velocity doesn't matters to determine if speed is increasing or decreasing
It's the acceleration

Velocity can be upward or downward
But the magnitude of velocity (which is also known as speed) can remain constant

[torn briar]

Ooh icic

How do you do e

[south pelican]

http://hyperphysics.phy-astr.gsu.edu/hbase/mi2.html#rlin"
Hope this helps I don't really know it myself.

[neat vortex]

the actual weight should come out to be 1.5N
but if the reading is less than that it means there's a pseudoforce on the object in a direction opposite to mg , so the lift must have a downward acceleration which will give a pseudoforce in the upward direction
so I would say the speed is decreasing

[torn briar]

I think you’re right thank you!

[compact sinew]

in a chemistry exercise, they gave me to balance using the ion-electron method (KMnO4 + H2O2===>MnSO4 +O2 + K2SO4 + H2O sulfuric acid medium) but in the correction they add H2SO4 in the reactive which isn't mentioned in the exercise. my question, how or why they added it????

[thorny gyro]

is there anyone who does physics that can help me with this question? for A i got 1082.4 nm multiple times and it was incorrect and i have no idea how to do B

[radiant yoke]

Butyric acid contains only C , H and O. A 4.24mg sample of butyric acid is completely burned. It gives 8.45mg of carbon dioxide(CO2)

The molecular mass of butyric acid was determined by experiment to be 88. What is the molecular formula ?

Can anyone help me with this pls.

I need some explanation

[cunning crescent]

Write down the information you have, it is useful to think of a strategy for the solution.
You have weight of CO2, and weight of the molecule C_xH_yO_z, let's call it A.
You are given the molecular weight of A and can easily find out for CO2.
Use this to calculate the moles of A and the moles of CO2. The sample is completely burned, therefore nCO2 = nC.
Then find the ratio of C moles and A moles, and you will find x.
You will find y and z by the remaining "available weight" of the molecular weight of A. There will be multiple possibilities for y and z but only one that makes sense structurally.

[mossy atlas]

hello can some one help me with Basic electricity

[dreamy spade]

I can

[open osprey]

Does anyone know a good place to study for APES.

https://tenor.com/view/dawg-skull-emoji-gif-24661581

[daring dune]

can anyone help me with my numericals?

[wary holly]

anyone help me with this?

[patent wren]

I would use the left hand rule ( I don’t know how it is called in English). The magnetic impulse will go from north to south. And the I goes down. So Lorentz force goes into the screen i think.

I think like this.

I may be wrong, it has been a long time 🙂

[wary holly]

thank you!

[radiant yoke]

Thank you so much

[left finch]

hi anyone can recommend me with anything to improve electronic .i suck at it

[lethal axle]

A diverging mirror of radius of curvature 40 cm forms an image which is half the height of the object. Find the object and image positions

[worldly finch]

does anyone know any good extra curricular activities i could do to beef up my personal statement. I want to major in computer engineering like James

[left finch]

thts cool man

[worldly finch]

thanksss

[lethal axle]

But how

[cunning crescent]

Biology: 1. How can I find endonuclease cleavage sites in a gene sequence?
2. How do I find a suitable plasmid in which the given region can be expressed?

I'm a chemistry student I am so fucking lost

[lethal axle]

Thank you so much my man