申論題

3. (25%) As shown in the figure below, a two-dimensional (2D) water jet with a velocity V and width h is impinging on a block on a sloping wall with an angle of inclination θsuch that the block does not move. The weight of the block is mg. Assume that the block is so small that the gravitational force acting on the jet stream and the resulting torque on the block are negligible. Neglect the flow viscosity.

(3) (10%) What is your answer in (2) if there is a frictional force with the coeficient of friction μ between the block's bottom and the sloping wall?