Friday

April 18, 2014

April 18, 2014

Posted by **ankur** on Thursday, June 6, 2013 at 3:20am.

(a)3.33 in2/sec

(b)3.67 in2/sec

(c)3.11 in2/sec

(d)none of these

- maths -
**Reiny**, Thursday, June 6, 2013 at 8:12amV = (4/3)πr^3

dV/dt = 4πr^2 dr/dt

when r = 6 , and dV/dt = 10

10 = 4π(36) dr/dt

dr/dt = 10/(144π) = 5/(72π)

A = 4πr^2

dA/dt = 8πr dr/dt

when r = 6

dA/dt = 8π(6)(5/(72π) )

= 30/9 = 10/3

= appr 3.33 -------> looks like a)

**Related Questions**

Calculus - a spherical ballon is being inflated at a constant rate of 25 cm^3/...

math - A spherical ballon is being inflated at the rate of 35cc/min. the rate of...

Physics - A 600-kg weather ballon is designed to lift a 4000-kg package. What ...

Physics - A 600-kg weather ballon is designed to lift a 4000-kg package. What ...

calculus - a splenical ballon is being inflated @ 10 cubic inches per secound. ...

math - This one is kinda hard. "A ballon in the shape of a cylinder with ...

calculus - This one is tough. "A ballon in the shape of a cylinder with ...

Math - A spherical balloon is inflated with helium at the rate of 100pi ft ^3/...

MATHS help plizzz - A spherical balloon is being inflated and its radius is ...

relaited rates - A spherical balloon is being inflated so that its volume is ...