A block is pressed against a vertical wall by a force P as shown. Kinetic friction exists between the block and the wall, and the coefficient of kinetic friction is 0.250. The weight of the block is 39.0 N, and the directional of the angle of the force P is 30 degrees.
a) Draw a free body diagram of the block
b) What is the normal force acting on the block? Your answer is to be in the form of an equation
c) What is the magnitude of the force P if the block slides down the wall at constant velocity?