A spherical balloon is inflated so that its volume is increasing at the rate of 2.7 ft3/min. How rapidly is the diameter of the
balloon increasing when the diameter is 1.3 feet
1 answer:
The formula for volume of a sphere is


If the diameter is 1.3, then

We are given

and



Change in diameter is twice change in radius, so we get 2*0.5085=1.017 ft/min
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