Sand is pouring out of a container at a rate of 20 cm3/s and is forming a canonical pile on the ground as shown in Figure 1. The height of the canonical pile is 40 cm and its radius is 16 cm. Assume that the sand spreads evenly to maintain a canonical shape. Determine the rate of change of radius of the canonical pile when the radius is at 8 cm?2cone13V r h     =

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