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September 3, 2014

September 3, 2014

Posted by **jj** on Tuesday, October 11, 2011 at 8:00pm.

- math -
**Reiny**, Tuesday, October 11, 2011 at 8:04pmdV/dt = 50 cm^3/s

V = (4/3)πr^3

dV/dt = 4πr^2 dr/dt

so when r = 10

50 = 4π(100) dr/dt

dr/dt = 1/(8π) cm/s = ... you do the button pushing,

(no calculator needed up to this point. )

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