Monday

April 21, 2014

April 21, 2014

Posted by **Z32** on Thursday, September 24, 2009 at 10:32pm.

V= 4/3*pi*r^3

S= 4 pi r^2

- Calculus -
**Reiny**, Thursday, September 24, 2009 at 11:02pmfrom V= 4/3*pi*r^3

dV/dt = 4pi(r^2)dr/dt

so when dV/dt=30 and r = 19

30 = 4pi(361)dr/dt

dr/dt = 30/[4pi(361)]

now in

A = 4pir^2

dA/dt = 8pi(r)dr/dt

= 8pi(19)*30/[4pi(361)]

= you finish it.

- Calculus -
**Z32**, Friday, September 25, 2009 at 12:27amGot it down to 3.157 which is correct. Thanks!

**Related Questions**

calculus - Air is being pumped into a spherical balloon so that its volume ...

Calculus - Air is being pumped into a spherical balloon so that its volume ...

calculus - Air is being pumped into a spherical balloon so that its volume ...

Calc - Air is being pumped into a spherical balloon so that its volume increases...

help on calculus - A spherical balloon is being filled with air in such a way ...

AP calculus AB - A spherical balloon is being filled with air in such a way that...

related rates problem-calculus - A spherical balloon is being filled with air in...

Calculus - Air is being pumped into a spherical balloon and the volume is ...

calculus - A spherical balloon is being inflated at a rate of 10 cubic inches ...

Calculus - A spherical balloon is being inflated at a rate of 10 cubic inches ...