A horizontal force FC = 25 N is acting at point C on link 4 and an external torque T2 is acting on link 2. The coefficient of friction between link 4 and the ground link is μ = 0.3, and the coefficient of friction between link 2 and the ground link is not specified, but is large enough that there is no slip at E. Assume that gravity is acting into the plane of the figure. Block 4 is 60 mm wide by 40 mm high, with pin B centrally located. Point C is 5 mm above the centerline.

(a) Determine the magnitude and direction of the external torque, T12, necessary to overcome the force, FC.

(b) Determine the magnitudes, the directions, and the locations of the internal reaction forces.

(c) Determine whether link 4 is slipping or tipping on the ground link 1.