Aspherical water balloon is filled with water and has the inside diameter of d=4 inch. the balloon develops a pinhole leak with the diameter of d=0.01 inch and the average exit velocity of v=1 ft/s. (a) determine the mass flow rate of the leak (in ibm/s). (b) first derive an expression for the rate dd/dr at which the balloon diameter changes, then evaluate dd/dt. recall that the volume of a sphere is πd^3/6.

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