Uniform horizontal sheets of water of 3-mm thickness issue from the slits on the rotatin...

Uniform horizontal sheets of water of 3-mm thickness issue from the slits on the rotating manifold shown in Fig. P11.3. The velocity relative to the arm is a constant 3 m/s along each slit. Determine the torque needed to hold the manifold stationary. What would the angular velocity of the manifold be if the resisting torque is negligible?