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