A small lawn sprinkler is shown in the sketch at right. At an inlet gage pressure of 20 kPa, the total volume flow rate of water through the sprinkler is 7.5 liters per minute and it rotates at 30 rpm. The diameter of each jet is 4 mm.

Calculate the jet speed relative to each sprinkler nozzle. Evaluate the friction torque at the sprinkler pivot

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Vrel a=30% Q= 7.5 L/min w= 30 rpm ||R = R = 150 mm Vrel Psupply 20 kPa (gage)