#help-33
1 messages · Page 215 of 1
!noping
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@mystic gazelle Has your question been resolved?
@mystic gazelle Has your question been resolved?
@mystic gazelle Has your question been resolved?
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How do i do this i have this as an example but i dont understand
@broken bough Has your question been resolved?
Ill send it
Youd have to tap on it
x = 4 is given so all you need is to solve for y
just substitute x = 4 into the top equation
5
Ohh okay thank you so much i have one last help with this one hold on
I dont understand how to put the word equations into an equation
What do you mean by putting a word into an equation?
Oh, I get it.
The word problem.
you don’t have any idea of how to translate it into math?
Like i just need help in putting it into the equation correctly
how about this, can you tell me how much it would cost to get two photos from lightning fast foto
5 + 0.2p = 7 + 0.1p
Is that the equation?
try solving it first.
do you want me to explain it
Yes please
okay, what is the question asking?
Which place is cheaper?
not quite
it's asking how many photos have to be taken on both sides for the fee to be the same
let me make an equation and I want you to dissect it
5 + 0.2p = 7 + 0.1p
fee fee
both sides are the fee don't pay attention to the variables
well actually the variables do matter
Is it 20?
What about 2 on this one
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Was looking to see how you guys would interact w the canceling of these units along with an explination. I know the first two interactions end in multiplication but apperently the last one ends in division which I dont completely understand.
What do you mean "ends in division"
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I need help on number 25
someting like f(x) = { 2, -6<= x<= 1
-2, -1<x<= 2
and so on
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\textbf{Theorem 6.42 (One-sided derivatives of a convex function)}
Let the function ( f ) be convex on an open interval ( I \subseteq \mathbb{R} ). Then ( f ) has finite one-sided derivatives from the left and from the right at every point ( a \in \mathbb{R} ).
Slowaq
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L1 = L2 = B
a(0,-1,1) + (4,2,1) = b(0,1,2) + (4,-2,-4)
- 4 = 4
- -a + 2 = b - 2
- a + 1 = 2b - 4
3 = 3b -6
3+6 = 3b
3 = b
a+1=6-4
a=6-4-1
a=1
B = a(0,-1,1)+(4,2,1)
B=(0,-1,1)+(4,2,1)
B=(4,1,2)
@buoyant jetty Has your question been resolved?
Have you tried subbing in B-A for AB and C-A for AC?
let me try to see if its perpendicular
B=(4,1,2)
A = (4,2,1)
C = (4,-1,-2)
,w ((4,-1,-2)-(4,2,1))
,w (4,1,2)-(4,2,1)
looks okay tbh
I think is correct
.solved
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Can someone help me understand sine and cosine law
What do you need help with?
Please show the original problem, exactly as it was stated to you, with the entire original context. A picture or screenshot is best. If the original problem is not in English, then post it anyway! The additional context might still be helpful. Do your best to provide a translation.
,tex .sine law
Bonk
,tex .law of cosine
That
Bonk
,tex .double angle
Bonk
,tex .half angle
Bonk
these ones?
I think so
What was the original question?
You either need to show the original question or articulate more clearly what problem you're facing with something.
like, understanding hwo to use them?
this is what it means
A, B and C are angles
and the ratio of the sine of the angle to the opposite sidelength is equal for all angles and sidelengths
to put it awkwardly into words
I get that part
so what more is there to understand?
here, try solving this one
A is 40, a is 6, b is 8
what is B?
Result:
0.64278760968654
So do the side of a go to the bottom
B 8 right
What the difference from what I said
Did I set that right to find b
thats not quite right
damn bro
Wouldn’t you cross multiple
You just need to multiply everything by 8...
You don't always need to cross-multiply
Is it 48
Nooo.
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hi
oui
est ce que
le parametre il est sur la borne ou dans l’expression a intégrer ?
envoie l’exercice
lequel
tu comprends pas quoi
tu connais le théorème de continue des intégrales à paramètres ?
bah si tu le connais pas pk tu veux essayer de faire des exercices dessus
grosso modo une intégrale à paramètre c'est quand tu intègres une fonction (intégrable) F(x,t) à deux variables sur une des deux variables, par exemple tu intègres F(x,t) sur t, et tu voudrais voir comment varie l'intégrale en fonction de l'autre variable, ici x
Tu as des théorèmes de dominations etc. qui te permettent de déduire rapidement qu'une telle intégrale varie continuement en fonction de x
Mais si tu es pas à l'aise avec les intégrales, c'est peut-être pas à ton niveau, parce que tu as de nombreux théorèmes que tu dois savoir utiliser etc. Genre c'est quoi ton objectif @dark oxide ?
le vent qu’il te met 😭😭
bruh
grosse force
toi t'as des questions? XDDD
nn ça va j’suis la pr aider mdr
bruh je me suis motivé et tout pour une fois bah
bonne chance également à toi XDDDDD
en vrai après avoir bouffé ça en agreg, crois moi je le recite en dormant ce truc XDDD
carrément t’as l’agreg toi
oue
scuse nous
en vrai c'est pas un concours dur genre ca montre juste si tu connais bien ton cours
MDR mais pardon terence tao
nan mais ptdr c'est l'agreg chill
c’est pas chill les développements
blague à part je comptais aider énorméemnt de gens en maths ou autre cette année parce que j'aurais bcp de temps donc hésite pas aussi eh
même pour des trucs que je sais pas on peut y reflechir ensemble etc
ça dépend, genre y a des dév qui sont vraiment très durs, genre c'est pas "difficile" c'est surtout qu'il faut vraiment le présenter en speed parce que t'es chronométré, puis t'as des dév qui sont vraiment plus simples typiquement tu pourrais les faire en L2
Z/pZ cyclique mdr
et genre si tu presentes un truc trop dur, les questions que le jury va te poser bah ca va etre hardcore
donc t niké
nah ça c'est limite pas dans les questions
par contre
si jcrois
jsp c'est quasiment par definition
bah faut le montrer mdr
tous les elements sauf 0 sont générateurs
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[
\begin{bmatrix}
1 & 0 & 0 \
2 & 2 & 3 \
-1 & 0 & 2
\end{bmatrix}
]
Task Bot
I found the diagonalizing matrix P but I don't know if I did it right
I found the eigenvalues $\lambda_{1}=1,\lambda_{2,3}=2$
Task Bot
Compile Error! Click the
reaction for more information.
(You may edit your message to recompile.)
So $\lambda_1$ has arithmetic multiplicity 1 while $\lambda_{2,3}$ has algebraic multiplicity 2
Task Bot
So since I got 3 distinct eigenvalues I can't say that it is diagonalizable for now
So I went to calculate the geometric multiplicities
And I found that $m_{g}(1)=1$ , so it coincides with the arithmetic one , and also $m_{g}(2)=2$ which corresponds to the arithmetic one
Task Bot
Did you find the 2 eigen space?
Yes
oh its their dimension ?
Yes
The dimension would be their geometric multiplicities
In more detail I found that $\vect{V_1={(t,-5t,t)}}$, \vect{V_2={(0,t,s)}}$
Where t and s are parameters
Write it with « vect » I think it would be better to show the bases
Task Bot
Compile Error! Click the
reaction for more information.
(You may edit your message to recompile.)
that doesn't look right
😦
,w [1, 0, 0
2, 2, 3
-1, 0, 2] * [0
0
1]
$\mathbf{V_1} = (t, -5t, t), \quad \mathbf{V_2} = (0, t, s)$
Task Bot
yeah it’s not good
Mmm
(0, 0, 1) is not an eigenvector
[
\begin{bmatrix}
0 & 0 & 0 \
2 & 1 & 3 \
-1 & 0 & 1
\end{bmatrix}
]
Task Bot
for the eigenspace associated with $\lambda=1$, Either $X=(x,y,z)^T$ try to solve $(A-I_3)X=0$ for $x,y,z \in \mathbb{R}$
yes
and $\rho(A) = 1$ so 3 - 1 = 2
jandro0103
2 free variables
<@&286206848099549185>
where even is the question
I need to find the diagonalizing matrix P
and where's your work
Above
we are working together btw
I can also take a photo but I don't know when it is clear
work to get this
how'd you get those eigenvalues
$det(A-\lambda I)$
Task Bot
take a photo
and where are your eigenvectors
V1 is correct
how did you get these
it’s not diagonalizable
(sending ...)
are the algebraic multiplicties equal to the geometric multiplicities?
yes
V2=vect(0,0,0)
then yea it's not diagonalizable
no..
What did I do wrong pls
why the matrix is not diagonalizable
I got rank 1
So
I did
dimV_2=3-1=2
Since the rank is 1 I have two free variables which are those not present in the chosen minor, in this case I took the minor -1 at the top left
So I have the system x=0, y=t, z=s
And therefore they are the same
no we have 1 bro
Since the rank is 1 I have two free variables which are those not present in the chosen minor, in this case I took the minor -1 at the top left
So I have the system x=0, y=t, z=s
But the rank is not 2
yes
jandro0103
so dim=1…
No
x = 0 , 2x + 3z = 0
yessssss
But
3z=-2x=0 omg
the rank is 1 yes ?
3 - 1 = 2
with multiplicity of 2
You can use this only if the eigenspaces are in direct sum
but they aren’t
we calculated it and it is vect(0,1,0)
his dimension is 1
it would be 2 if A was diagonalizable
Why was I wrong?
i don’t know but it’s not diagonalizable
I wrote that the rank was 1, however, perhaps isn't and I don't know why
for $X=(x,y,z)^T$, find x,y,z such that $(A-2I_3)X=0$
ss
Task Bot
yeah it’s that, now multiply by the matrix X
[
\begin{bmatrix}
-1 & 0 \
2 & 3
\end{bmatrix}
]
Task Bot
No, you would lose the y
do it with this one
The first two rows are clearly linearly independent; in terms of minors you can look at the minor formed by rows 1,2 and columns 1,3. In the solution it is written because the rank of this matrix is 2
No
okay
But I'm trying to find the rank
[
\begin{bmatrix}
-1 & 0 & 0 \
2 & 0 & 3 \
-1 & 0 & 0
\end{bmatrix}
]
Task Bot
Of this
just solve this and you’ll have the dimension of the eigenspace associated with 2
and if it’s not 2, it is not diagonalizable
But the thing I don't understand is why the rank is 2
even chatgpt says it’s not diagonalizable 😭
Indeed
idk it’s maybe not possible to do this method in this case
Mmm
oh
i’m dumb
rg(A-2I_3)+Ker(A-2I_3)=3
so such that rg is 2, the eigenspace dimension associated with 2 is 1
which is Ker(A-2I_3)
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Guys I want to be good at typing math symbols in Discord or Stackoverflow. what's the most popular and common thing called? Is it Latex?
you can use alt codes for some small symbols, but most of the times latex gonna help
so yeah if you know some basic latex commands that's gonna help ya
Watch the yt vid on Latex by freecodecamp
read the resources in #latex-help and #latex-testing
@karmic plume Has your question been resolved?
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I have some sequence derived from test these are pretty hard and i wonder how i can tackle them:
These are the sequences in question missing is "?",
16 ,8 ,? ,110 ,-935
6 ,33 ,? ,45 ,46
1 ,40 ,? ,1000 , 625
4 , 2, ? ,-2 , 14
These sequences dont make much sense any way to tackle them?
values seem to random
Right, yet there should be a answer according to this test..
I have broken my head over them, cant figure it out for my life
what class is this from
No class, its an online assessment for a job position, its category is sequence solutions.
I thought I am just stupid, but if math genius levels dont see the answer then atleast i know i am not that stupid i guess
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Difference between bar chart and histograph?
can anyone show in image the example?
guys dont show her anything shes rude and she thinks we r working for her bye
left is a histogram, right is a bar chart
Can you shit post in another channel?
girl dont help her she lit said that u dont deserve anything just bc i told her to say can you not (show me an example)
a bar chart don´t always have multiple bars on one catogory (year this example)
all histograms are bar charts, but not all bar charts are histograms
the only difference is the SPACE?
just like both your thumbs are fingers, but not all your fingers are thumbs
make sense?
no
bar charts are a whole range of graphs
a histogram is just a specific type of bar chart
not necessarily
you could interpret a histogram as a more “continuous” representation
This is my data for histograph
but yeah, a histogram, as said before, is a type of bar chart
is THIS histograph? @summer grove
yeah, see how the intervals fit with each other?
yes
*histogram, yes
isnt each bar supposed to be the range, like
0-4 and the bar up to 11
wdym?
thats what its doing
It seems the x labels are placed between the bars
So I guess that signifies ranges
etc
!noping
Please do not ping individual helpers unprompted.
context?
the graph doesn’t necessarily match with the table “space”-wise
Oh I see, the graph was made from the table
your graph implies that the end interval is closer than it actually is
Huh?
@regal coral @ancient copper @summer grove would this be histograph Y/N
it already is a histogram
???
wdym
if i mark X axis like this.
BONK.
....
bonk is the sound when people are in bed
😆
what the fuck
didn’t u ask this question 5 minutes ago
this one
that's how they look on wikipedia
this is for example like this
omggsmgs,mdgmsgmsdgjsdgjsjdgjgdsjsdgjhgskhsihugaihusgoqwglqiughqowoihwgheifowifugfoiggfwgoiufgowff
fd
afs
d
ads
asdf
adsf
adfs
dsa
dsf
this is also a histogram
what do THE X AXIS NUMBER INDICATE ON THIS ONE?
so like the first bin would be 0.5 to 1
then 1 to 1.5
because in between 1 and 2 must be 1.5
they all have width 0.5
do a table for this histograph
i think im talking to ai...
no.
i think it’s better not to shitpost and go mentally insane and focus on he question instead
cause, you know, that’s what you asked help for
it’s just like you did earlier
im like studying icelandic rn in the meantime
label the endpoints of the bins and approximate the height of the bins
so...focus on this, or no?
!nogpt
Please do not trust ChatGPT or similar AI tools for mathematical tasks, as they often generate output which "sounds correct" but has numerous factual or logical errors. Use of these AI tools to answer other people's help questions is strictly against server rules (see #rules).
ok ill talk about this tomorrow.
!volunteers
Helpers are just people volunteering their time to help you. Be polite and patient.
.close
Closed by @woven condor
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very important!!!!
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I will ask again here
no one answered my previous question
close one of your channels
but you havent even asked your qurstion
@still temple Has your question been resolved?
They asked in #help-13.
They wanted to see if their answers were correct.
You have to close one of the channels you have, because you can't have the same question on two open channels, because that can lead to people not seeing whether you're being helped in the other channel and a duplication of effort.
OK, B says that 2 is a prerequisite of 11.
Why do you think that's the case?
wait so im wrong?
Honestly just a educated guess
OK, but look at the description they gave. Can you find where they said that 2 is a prerequisite of 11?
I cant
OK, so B can't be the answer.
That's one way to work through the problem.
The other way is to draw the graph yourself and see which answer matches yours.
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✅
I chose C
OK, what is a bridge?
That's an edge.
A bridge is a special kind of edge.
A bridge is an edge where, if you delete it, the number of graph components increases.
Does that make sense?
yes
not sure
OK. What's a component?
Well, think of a map with roads on it.
You have cities and roads that connect them.
A component of that would be a bunch of cities where you can use the roads to get from one of the cities in that component to any other city in that component.
If you have two cities and there's no way to take some roads from one to another, they're not in the same component.
Does that make sense?
Like the cities in Hawaii wouldn't be in the same component as the continental United States.
ok
Not only that, but the cities on different islands of Hawaii wouldn't be in the same component as each other.
Hey man I will stop asking questions, just tell me if my answer is correct
Sorry, it's not.
ok bte
@torn sinew Has your question been resolved?
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Currently learning about logs and its rules/laws. I'm curious if there was anything special about multiplying 2 logs, like the same way you can simplify 2 logs being added together/subtracted.
I concluded there wasn't much to take away from it
dont think so
You have that alog(b) = log(b^a), so if a is a log and b is the appropriate base, there is some cancellation.
I'm assuming you're referring to the end of my second line, which should cancel out to 12log_2(2) = 12
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need help with 15-26
@true leaf Has your question been resolved?
@true leaf Has your question been resolved?
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Review of Calc 1 in Calc 2,
What did I miss in my work, my final answer ended up being wrong
$\cos 0\ne 0$
SWR
cos(0) is not 0 nor e^0
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@merry hinge Has your question been resolved?
2012 = 2¹⁰+2⁹+2⁸+2⁷+2⁶+2⁴+2³+2²
This gives you the starting point to find other solutions
ngl im really lost here
i understand this but... do you not think thats a lot of manual work?
Idk wth i typed !
See the edited text
There may be a simpler way !
yeah it was wrong but i understood that
ikik
wdym
We have 3 cards with the same power of 2 right ?
I meant if you break 2^10, then we can't introduce any more 2^9
But that's making the sum a lot more complicated!
exactly!
i did sum of 1+1+2+4+...1024=2048
for 2012 i need to remove 36 from this
but couldnt get anywhere from here
maybe no. of ways to get 36 from powers of 2 taken any in number
@merry hinge Has your question been resolved?
<@&286206848099549185> 😭
@merry hinge Has your question been resolved?
Hey i was busy !
I will try this later ! And will DM you if it gets solved !
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how is $\angle APQ=\angle BCA$ where AQXP is a parallelogram?
babario
what is the condition for $ABCD$, for example, to be a parallelogram?
ss
D is just altitude
ABC is any acute tri
In terms of distance
oh and BPX~XQC
what’s that?
babario
oh ok so in my example , $ABCD$ is a parallelogram $\iff AB=DC$
ss
so for you it’s $AP=QX$
ss
.close
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Can someone help me with this question my math isn’t very good
your allowed yo use calculators right?
ye
do you know soh cah toa (or some alternate acronyms)?
ty i will work on it
yep i know
yeah basically this
so pythagoras and trig
ye
this was so much easier than i thought i was just overthnking
thanks guys for help[
@dreamy harness Has your question been resolved?
(I think I did it wrong)
o
DC is 100 x sin32.4
53.6
And BD is just Pythagoras so it’s 100 squares + 86.9 squared
yes
let me check
Ok
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i have no understanding of how to solve this except ik the equations for the area of a sector, the length of an arc, and the cosine and sine rules
otherwise i have absolutely no clue what to do here
the only idea i MIGHT have is to make lines from the left point up and make them touch the places where the two circles meet to find THAT sector area
but otherwise im at a loss
but there's an issue here
i dont have the angle in between the two radii (which are going in almost opposite directions)
i assume i can use the cosine rule to find it but even then, how?
oh wait
i understand it now, i need to use the diameter
to make it like a triangle first and then use the angle to find the sector area
oh wait, that doesn't work though
because the two intersections are not completely opposite of each other
can someone help i have no idea what Im doing
yeah that's what i was just starting to come up with
that's actually extremely helpful, thanks a lot owen
@onyx venture Has your question been resolved?
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\textbf{P3.} The carts A and B in the figure are connected by an ideal rope, which passes over a fixed (also ideal) pulley. A force $F = 25$ N pulls cart B parallel to the inclined plane downward. Cart A has a mass of $2$ kg, cart B has a mass of $3$ kg, and all frictional forces are neglected.
\textbf{P3.a.} Calculate the acceleration of the system.
\textbf{P3.b.} Calculate the tension in the rope.
938c2cc0dcc05f2b68c4287040cfcf71
@buoyant jetty Has your question been resolved?
and where are you stuck?
you almost finished the problem
only step left is to write the force equations for both blocks
?
how
take cart A
say it moves with acceleration a in the horizontal direction
now the only horizontal force is tension
use Newton's second law to write the relation
F = ma
what would you get then?
F = 2a
no
its inclined
wdym Moves along?
if I move B by some distance d
A should also move by d
if B has velocity v
A should also have velocity v
same goes for acceleration
this is true for movement of any two particles connected by a tight rope
hmmkay
seems like hard to understand
what about sum of Forces of B
how do I figure out the tension
?
what about the sum of forces in B
in B is tricky because normal is not the same as the weight
do you know how to resolve vectors into two?
into x and y components?
somewhat like that
no
can i get some tips
a vector can be resolved into one along x axis and other along y axis
say the vector makes angle $\theta$ with the x axis
then the component along the x axis is $F\cos \theta$ and the component perpendicular to the x axis is $F \sin \theta$
which vector are we talking about doe
which vector we talking about doe
for Wb
how do I find the weight
mass of B is 3
but idk
how do I find the normal of B
F = 25 sin(37)
what about normal weight and tension
weight is a force which is given by mass*acceleration (here acceleration is "acceleration due to gravity" often denoted by "g")
So W_B = M_B * g
You further need to resolve W_B and on resolving you will find that the normal of B will cancel out with a component of W_B ...so you don't have to bother about normal of B
Here we are hence only bothered about the component of W_B along F (or inclined plane)
You should
. this is how you find wb
ya right
yes for that you need to learn resolution of vectors
specifically resolution of vectors on inclined plane
At last on finding resolution of wb...you will get another equation to finally get Tension and Acceleration ....this equation would be given by : T= F + Wb_along_F
@buoyant jetty Has your question been resolved?
Wb = mg = 3g = 30N
Wb = hypotenuse
hyp = mg = 3.g
Wbx = mg sin (37)
Wby = mg cos (37)
Soh Cah Toa
Sin(x) = op/hyp
Cos(x) = adj/hyp
Tan(x) = op/adj
Wb = hyp = mg = 3g
sin(37) . hyp = op
hyp = 3g
(3g)sin(37) = op
op = Wbx
Wbx = 3g sin(37)
Wby = 3g cos(37)
T = F + Wb_along_F
T = F + Wbx
T = F + 3g sin(37)
T = 25 + 30sin(37)
,w T = 25 + 30sin(37°)
T ≈ 43 N
no its not
we need to find the acceleration first
Wbx = 3g sin(37)
Wby = 3g cos(37)
Wbx = 30 sin(37)
Wby = 30 cos(37)
,w 30cos(37)
Wbx = 30 sin(37) ≈ 18N
Wbx = 30 sin(37) ≈ 18N
Wby = 30 cos(37) ≈ 24N
a_x = a_y because they are connected by a rope
T = 2a
T = 25 + Wbx = 2a
43 = 2a
T = 25 + (3a)sin(37)
T = 2a
2a = 25 + 3a sin(37°)
2a - 3a sin(37°) = 25
a(2 - 3sin(37°)) = 25
a = 25/(2 - 3sin(37°))
,w a = 25/(2 - 3sin(37°))
,, a = \frac{\sum \text{Forces}}{\sum \text{Mass}}
938c2cc0dcc05f2b68c4287040cfcf71
sum of masses = (3+2) = 5kg
3a = Wbx + 25
3a = 18N + 25N
,calc (18+25)/5
,, a = \frac{18N + 25N}{3kg + 2kg}
because they are connected by a rope
they have same acceleration
in this case sum of forces in x
in this case the free body diagram of B
indicates that the force F = 25N pulling the body B downhill is in the x axis
we are given Wb = 3 x g = 30 N
but we need to find Wb x axis component
Wbx = 30 sin (37°)
,w 30 sin(37°)
Wbx ≈ 18 N
T ≈ 17.2 N
a ≈ 8.6 m/s^2
fnet in x
Wbx + 25N - T = Mb . a
T = M_A . a
Wbx + 25N -(M_A . a) = M_B . a
Wbx + 25N = (M_B . a) + (M_A . a)
Wbx + 25N = a(M_B + M_A)
(Wbx + 25N)/(M_B + M_A) = a
I think I got it broo
I like physics I like it
I am liking it bro
.solved
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Hi
do u know how to factorise
!15m
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Oh sorry
Do you know completing the square ?
Oh nvm
what does the question ask for?
Target 2: Complete the Square
,tex .cts
I read the 10 as a 0
riemann
x^2 -4x - 10 = x^2 + bx + c
identify b and c. the bottom two equations tell you what to add to complete the square
Have you seen the graphical explanation before
This is a short, animated visual proof showing what is meant when we "complete" the square algebraically and justifying why the formula holds for positive real numbers. #mathshorts #mathvideo #math #completingthesquare #mtbos #manim #animation #theorem #pww #proofwithoutwords #visualproof #proof #iteachmath #algebra
_______________...
Lemme watch dat
@ripe sun Has your question been resolved?
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When are you allowed to switch integral and sums?
im pretty sure the conditions are quite complex, but most of the time (esp when working in some type of real world applications) you can swap them
If all f_n are non-negative no problem
Yeah but why?
there are several sufficient conditions depending on whether this is riemann or lebesgue integration
because you can prove it
ah wait, this is real analysis right?
How do I prove that?
this is lebesgue integration i think
look up monotone convergence theorem
yeah it's monotone convergence theorem
for functions that are not necessarily positive, the dominated convergence theorem is the usual tool
otherwise you would require $\sum_n \int_\Omega |f_n|d\mu < \infty$ or $\int_\Omega \sum_n |f_n|d\mu < \infty$
rafilou is not not born in 2003