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Mathematics 7 Online
OpenStudy (anonymous):

sand falls from an over head bin and accumulates in a conical pile with radius that is always three times the height. suppose the height of the pile increases at a rate of 2cm when the pile is 12cm high. at what rate is the sand leaveing the bin that instant

OpenStudy (amistre64):

you will want to know the formula for the volume of a cone

OpenStudy (amistre64):

since r = 3h, replace r by 3h and simplify the results take the derivative of V wrt.h and insert the given info to solve for V'

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