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A pump steadily draws water at a mass flow rate of 20 lbm/s, through a piping arrangement. The pressure at the inlet is 14.7 lbf/in^2, the temperature is 68 F, and the velocity is 10 ft/s. At the pipe exit, the pressure is 20 lbf/in^2, the temperature is 68 F, and the velocity is 40 ft/s. The exit is located 50 ft above the inlet. Determine the power required by the pump, in Btu/s, and horsepower.
The angular acceleration of a shaft is defined by the relation a = -0.25w, where a is expressed in rad/s^2 and w in rad/s. Knowing that at t=0 th angular velocity of the shaft is 20 rad/s, determine the time required for the shaft to come to rest.
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