A growing sand pile . Sand falls from a conveyor belt at the rate of ` 10m^(3)//"min"`
Channel: Doubtnut
Date: 2020-04-26

A growing sand pile . Sand falls from a conveyor belt at the rate of ` 10m^(3)//"min"` on to the top of a conical pile. The height of the pile is always three-eights of the base diameter. How fast are the (a) height and (b) radius changing when the pile is 4 m high ? Answer in cm/min.