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Water enters a rotating lawn sprinkler through its base at the steady rate of 16 gal/min as shown in Fig. P5.87. The exit cross-sectional area of each of the two nozzles is 0.04 in.² , and the flow leaving each nozzle is tangential. The radius from the axis of rotation to the centerline of each nozzle is 8 in.

(a) Determine the resisting torque required to hold the sprinkler head stationary.

(b) Determine the resisting torque associated with the sprinkler rotating with a constant speed of 500 rev/min.

(c) Determine the angular velocity of the sprinkler if no resisting torque is applied.

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