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Mathematics 7 Online
OpenStudy (anonymous):

A raindrop is a perfect sphere with radius r cm and surface area S cm2. Condensation accumulates on the raindrop at a rate equal to kS, where 4 cm/sec . Determine the rate at which the radius of the raindrop increases. Rate=_____cm/sec please explain? thanks!! :D

OpenStudy (anonymous):

What is the formula for surface area of a sphere? Using that, you can relate the rate surface area increases to the rate the radius increases.

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