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1. the radius of a cylinder is decreasing at a rate of 1 cm/min . the height remains the same as 20 cm . hoe fast is the volume changing when the radius is 12 cm?
2. a balloon is rising at a rate of 200 m/min . for every 500 m increase in height the air pressure causes the radius to increase 2 cm. find the rate of increase of the volume when the radius is 10 cm?
3. the dimension of a conical tank is of radius 3 m and height 6 m. what is added to is at a rate of (派) m^3/min . find the rate of change of wate level when the height is 3m?
需要过程。。。谢谢。 |
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