Posted by Eli on Friday, October 8, 2010 at 8:59am.
Solve this equation for the depth, H:
T = 2.95s = (time to fall) + (time for sound to arrive)
= sqrt(2H/g) + H/(340 m/s)
Convert it to a quadratic equation for H and solve for the positive root.
Water flows (velocity initial=0) over a dam at the rate of 660 kg/s and falls vertically 81 m before striking the turbine blades. Calculate the rate at which mechanical energy is transfered to the turbine blades, assuming 55% efficiency.
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