R13–4. If the motor draws in the cable at a rate of v = (0.05 s3/2) m/s, where s is in meters, determine the tension developed in the cable when s = 10 m. The crate has a mass of 20 kg, and the coefficient of kinetic friction between the crate and the ground is µ,; = 0.2.

Body U with mass 5m is stacked on the top body W with mass m, and released. The bodies are in contact along the frictionless interface at 45 to the vertical. The body U is in contact with the frictionless vertical wall. Body W lies on the floor with coefficient of friction u. Relevant h dimensions are shown in the figure. Express the results in U: 5m terms of given quantities: m, g, h and µ (except when u is given numerically). You need not evaluate sin 45° = cos 45° = 2/2. 45 1 Draw the free body diagrams for the two bodies. W: m Find the critical coefficient of friction µ. (i.e., the minimal coefficient friction to prevent sliding). 3h 31 Let u