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OpenStudy (anonymous):
a ruptured oil tanker causes a circular oil slik on the surface of the ocean. when it's radius is 200meters, the radius of the slick is expanding to 0.8m/min it's thickness is 0.08 meters. at the moment, how fast is the area of the slick expanding?
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OpenStudy (anonymous):
a) a = pir^2 da/dt = 2pirdr/dt da/dt = 2pi*200*0.8 da/dt = 320pi m/min
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