Posted by Anonymous on Monday, March 28, 2011 at 4:39pm.
V = (4/3)πr^3
dV/dt = 4πr^2 dr/dt (#1)
when 4πr^2 = 2π
r^2 = 1/2
r = 1/√2
in #1:
10 = 4π(1/√2)^2 dr/dt
10= 2π dr/dt
dr/dt = 5/π or 1.592 inches/sec
check my arithmetic
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