The 3-kg collar starts from position A with an initial velocity VA = 3 m/s and slides along the smooth fixed rod in a vertical plane. A constant force P is acting to the collar during its motion. If the collar comes to rest at B, determine the magnitude of force P. Use b = 0.8 m, h = 1.7 m, and 0 = 30°. (P = 41.2 N) b 018 VA A P 1.77 h my B

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