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January 30, 2015

January 30, 2015

Posted by **help** on Monday, February 20, 2012 at 10:24pm.

I got 3/pie, is that correct?

- Calculus -
**Reiny**, Monday, February 20, 2012 at 11:09pmI got 4/π

let the radius be r, then the height is 2r

V= (1/3)πr^2 h

= (1/3)πr^2(2r)

= (2/3)πr^3

dV/dt = 2π r^2 dr/dt

when 2r=.5

r = .25 and dV/dt = .25

1/4 = 2π(1/16) dr/dt

times 8

2 = π dr/dt

dr/dt = 2/π

d(2r)/dt = d(height)/dt = 4/π

- Calculus -
**help**, Tuesday, February 21, 2012 at 2:02amThank you!

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