Please solve these questions in details and fully explaination. Thanks so much in advance.

1. Determine the magnitude and the direction 9 (in degrees) of the minimum force P (in Newton) needed to pull the 60 kg roller over the smooth step, if R = 0.25 m and L = 0.03 m. 2. The rod supports a cylinder of mass m = 80 kg and is pinned at its end A. If it is also subjected to a couple moment of M = 500 N-m, determine the angle 6 for the system to be in equilibrium in degrees. The spring has an unstretched length of 1 m and a stiffness of k = 600 N/m. L1 and L2 are 1.6 m and 1.4 m, respectively