anyone can help with a calculus question?

[rony31]

math was my best subject in high school but I haven't touched it since entering University... well actually I took biomechanics last year and taking a more advanced one this year... I'm so ****ed because I didn't even understand that question

 

[ShiftyPowers]

P = E² R / (R + r) (R + r)

P = E² R / R² + R r + R r + R²

P = E² R / R (R + r + R + r)

P = E² / 2 R + 2 r

That is as far as i got i am not sure if 2 R + 2 r = 4 r though it doesn't make sense since R is variable and r is fixed.

It's calculus dude, this doesn't help in any way.

Damn, I used to be a wiz at this crap (this is pretty easy calc if I'm not mistaken), but I haven't taken a class in over 5 years now.

 

[jani]

haha the EXACT SAME QUESTION came out just now in the exam

thank you Dave, really, thank you.

 

[rony31]

isn't it awesome when you're studying off past exams, memorize some questions and they end up being on your exam too?

 

[jani]

It happens only like once in 98479508 exams though

 

[champdave]

Yeah but, your mum.

Don't even try coming back

You can only come back to a your mum statement with another one. And I thought it'd be pertinant to put in a more topical variation

haha the EXACT SAME QUESTION came out just now in the exam

thank you Dave, really, thank you.

Haha not a problem. 1 for the SG community, 0 for the people who set the exams

 

[Yossarian]

Dave.....as if you didn't already rule enough, brah.......man, I've always had a thing for Math whizzes.......

 

[Tom]

You can only come back to a your mum statement with another one. And I thought it'd be pertinant to put in a more topical variation

Yeah but, your mum.

 

[Mandieta6]

If SG were voodoo, man, if SG were voodoo...

 

[champdave]

.......man, I've always had a thing for Math whizzes.......

This sounds ominous? Is it time for the by-now traditional cork up the arse for safety purposes?

 

[Áļéאָ]

If SG were voodoo, man, if SG were voodoo...

3DFX ftw!!

 

[Tom]

3DFX ftw!!

 

[Mandieta6]

.....

That's not what I meant....

.....

Geeks.

 

[Joe]

So, did Newton "find" calculus or "create" it?

 

[Filipower]

who cares?

 

[Joe]

Well, who cares about calculus and this topic?

 

[Tom]

...

Agreed.

 

[champdave]

So, did Newton "find" calculus or "create" it?

I think it was probably a combination of both, given that maths is essentially a man-made discipline or language used to quantitatively describe natural phenomena. The links were there to be discovered (like discovering pi, e etc) but they had to generate how to differentiate/integrate by themselves.

Leibnitz didn't do a bad job either!

 

[jani]

heheh

sorry, last minute problem, exam is in less than 12 hours!

Here goes:

A leaky 10-kg bucket is lifted from the ground to a height of 12 m at a constant speed with a rope that weighs 0.8 kg/m. Initially the bucket contains 36-kg of water, but the water leaks out at a constant rate and finishes draining just as the bucket reaches the 12 m level. How much work is done?

Answer is 3857 J. Cant seem to get it!

Dave the mathematical master, please help.

 

[ShiftyPowers]

So, did Newton "find" calculus or "create" it?

Neither, Leibniz did, and I'm sure Patrick Riley would agree with me.