Saturday

October 25, 2014

October 25, 2014

Posted by **-Minx-** on Wednesday, August 17, 2011 at 11:18pm.

(a).volume is increasing

V= 3/4 pie r^2

(b). surface area is increasing

A = 4 pie r^2

- MATHS help plizzz -
**Reiny**, Thursday, August 18, 2011 at 8:41amYour formula for volume is incorrect.

V = (4/3)πr^3

dV/dt = 4πr^2 dr/dt

so when r = 4

dV/dt = 4π(16)(2) = 72π cm^3/minute

A = 4πr^2

dA/dt = 8πr dr/dt

when r=4

dA/dt = 8π(4)(2) = 64π cm^2/min

**Answer this Question**

**Related Questions**

Calculus - A spherical balloon is inflated at a rate of 10 cubic feet per minute...

Math - A spherical balloon is being inflated. Estimate the rate at which its ...

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

Calculus - A spherical party balloon is being inflated with helium pumped in at ...

math-calculus - A spherical party balloon is being inflated with helium pumped ...

Calculus - a spherical balloon is inflated with gas at the rate of 500 cubic ...

Math - A spherical balloon is being inflated so that its volume is increasing at...

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

calc - hydrogen is being pumped into a spherical balloon at the rate of 250 ...

calculus - air is being pumped into a spherical balloon at a rate of 8 cm^3/min...