Mathematics, 19.07.2020 14:01, kinglightskin2k

An open can of oil is accidentally dropped into a lake; assume the oil spreads over the surface as a circular disk of uniform thickness whose radius increases steadily at the rate 10 cm/sec. At the moment when the radius is 1 meter, the thickness of the oil slick is decreasing at the rate 4 mm/sec; how fast is it decreasing when the radius is 2 meters? (Watch the units!)

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An open can of oil is accidentally dropped into a lake; assume the oil spreads over the surface as a...