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- Thread starter mvgio124
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Does that help?

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Yes the second term there looks wrong. Remember, Volume is [tex]\pi[/tex]*r

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Take a breather

[tex]\frac{d(r*r)}{dt}[/tex] = 2*r*[tex]\frac{dr}{dt}[/tex]. So that (5/200)^{2} you plugged in, is wrong.

[tex]\frac{d(r*r)}{dt}[/tex] = 2*r*[tex]\frac{dr}{dt}[/tex]. So that (5/200)

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It's not 2/40, it's 4/40. You should be more careful with your calculations..

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