A circular oil slick spreads in such a way that its radius is increasing at the rate of 20 ft/hr. How fast is? - 20 ft gloucester sailboat
A circular oil slick spread, so that the radius increases at a speed of 20 m / hr How fast is the area that is changing the spot where the radius of 200 meters?
Tuesday, December 8, 2009
20 Ft Gloucester Sailboat A Circular Oil Slick Spreads In Such A Way That Its Radius Is Increasing At The Rate Of 20 Ft/hr. How Fast Is?
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They are there dr / dt = 20, and you want to search dt dA /, where
r = 200
A = pi * r ^ 2
dA / dt = 2pi * r * dr / dt
dA / dt = 2 pi * 200 * 20 = 8000pi
Answer: 8000pi m² / h
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