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nukeman
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Homework Statement
Air is being pumped into a spherical balloon. Suppose we know the surface area of the balloon increases at a rate of 20cm^2/s when its radius is 4cm. What is the rate its volume is changing at that instant?
Homework Equations
The Attempt at a Solution
I went...
dv/dt = 4∏ (4)^2 * 20/1 = 1280∏
I know its wrong. Anyone help me out? What am i doing wrong?
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