wtf is this | Mathematics | Page 1

sonic sequoia Jul 21, 2024, 12:52 PM

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Can someone please help me with this question it is unbelievably hard for no reason ive tried couple times to solve it but im still lost

limpid beaconBOT Jul 21, 2024, 12:52 PM

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sonic sequoia Can someone please help me with this question it is unbelievably hard for no rea...

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sonic sequoia Jul 21, 2024, 12:53 PM

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i neeed help with the whole question

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i did it on my CAS calculator

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i dont know what to do

feral heron Jul 21, 2024, 12:53 PM

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You don't really need a calculator here.

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What have you tried?

sonic sequoia Jul 21, 2024, 12:56 PM

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i tried using the integeral formula to find the volume

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but it doesnt seem to wrk

feral heron Jul 21, 2024, 12:57 PM

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Can you show how you did it?

sonic sequoia Jul 21, 2024, 12:59 PM

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i dont have my phone on me so i cant take picture rn

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so i defined the function of c(x)

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and then using the integral of -2,2 with c(x)

feral heron Jul 21, 2024, 1:01 PM

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Alright. Whad did you get?

sonic sequoia Jul 21, 2024, 1:02 PM

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lieterally the same thing

feral heron Jul 21, 2024, 1:02 PM

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What? Same as what?

sonic sequoia Jul 21, 2024, 1:02 PM

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its so dumb

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like i solved it

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and it gives me the same thing but this time the funtion is not defined and is still inside the integral formula and there is -4 at the end of it equaling zero

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so integral-4=0

feral heron Jul 21, 2024, 1:05 PM

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Sorry, I don't get what you mean.
The area of the cross-section would be the integral of (a(2 - b)^2 - C(x)) from -2 to 2. So, it should be a function of b.

sonic sequoia Jul 21, 2024, 1:06 PM

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wait ill try this on my calculator

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can you explain why im doing that?

feral heron Jul 21, 2024, 1:06 PM

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Don't use a calculator.

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Just write it.

feral heron Jul 21, 2024, 1:07 PM

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sonic sequoia can you explain why im doing that?

The maximum value of C(x) is at x = ±2, which is a(2 - b)^2. So, the area of the cross-section is the area between y = C(x) and y = a(2 - b)^2.

sonic sequoia Jul 21, 2024, 1:08 PM

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hmmm im still so confused

feral heron Jul 21, 2024, 1:09 PM

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Have you tried drawing the graph of C(x)?

sonic sequoia Jul 21, 2024, 1:09 PM

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yes its an open trapzeium

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cross section of the barge

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should i do this?

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bro u there?

feral heron Jul 21, 2024, 1:17 PM

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sonic sequoia cross section of the barge

Yes, that would be the area.

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Note that C(x) is even, so you can simplify the integral.

sonic sequoia Jul 21, 2024, 1:17 PM

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so i try the formula i showed u..?

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bro how r u so smart

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i got 4(a(2-b)^2- integral of c(x) of 2 ,-2

feral heron Jul 21, 2024, 1:19 PM

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One sec, let me check.

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No, I don't think it's quite correct. Can you show what you did?

sonic sequoia Jul 21, 2024, 1:22 PM

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alr give me 2 min

feral heron Jul 21, 2024, 1:24 PM

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I don't quite understand how they got their answer, though.
As far as I understand, we need to find the volume of the whole barge, which will be the result of that integral multiplied by its length (10 m). So, it will depend on both a and b.

sonic sequoia Jul 21, 2024, 1:24 PM

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btw the mass of type A barge is

feral heron Jul 21, 2024, 1:25 PM

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Don't use a calculator. Do it yourself.

sonic sequoia Jul 21, 2024, 1:25 PM

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Screenshot_2024-07-21_at_11.21.32_pm.png

sonic sequoia Jul 21, 2024, 1:26 PM

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feral heron Don't use a calculator. Do it yourself.

i havent been taught on how to do this question by hand so my school has given us access to calculator as an aid

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the whole paper is tech active

feral heron Jul 21, 2024, 1:26 PM

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Oh...

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Sorry, then I don't think I'll be able to help here. I'm not familiar with this approach of solving problems.

sonic sequoia Jul 21, 2024, 1:27 PM

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is there anyone who can help me

feral heron Jul 21, 2024, 1:27 PM

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Maybe. If someone sees this post and they can help with this, they might.

sonic sequoia Jul 21, 2024, 1:28 PM

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why cant you do it?

feral heron Jul 21, 2024, 1:29 PM

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sonic sequoia why cant you do it?

I'm used to doing these kinds of problems by hand. Besides, I don't have a pocket calculator that can solve integrals. I don't think I've ever seen one.

sonic sequoia Jul 21, 2024, 1:30 PM

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dam alr thanks for your help

gleaming drift Jul 21, 2024, 4:29 PM

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sonic sequoia i havent been taught on how to do this question by hand so my school has given u...

That doesn't make any sense. Calculators are for speeding up the grunt work of math, you still have to understand the process well enough to know what to input.

sonic sequoia Jul 22, 2024, 6:42 AM

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oh well then im not that smart

#wtf is this