## The radius of a sphere is increasing at a rate of 5 mm/s. how fast is the volume increasing when the diameter is 60 mm? evaluate your answer

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## Answers ( No )

The diameter of the sphere is 60 mm which means its radius is 30mm. The radius of a sphere is increasing at a rate of 5 mm/s.

The formula for the radius when the time is x second would be:

r(t)= 30+ 5x

dr/dt= 5

The speed of volume increase of the sphere volume would be derived from sphere volume:

V(r)=4/3* pi * r^3

dV/dt= 4/3 * pi * 3r^2 * (dr/dt) =4/3* pi * 3(30)^2 * 5 = 18000 pi= 56571 mm^3/s