Problem 8.33 The man having a weight of 200 lb pushes horizontally on the crate. The coefficient of static friction between the 450-lb crate and the floor is μ = 0.3 and between his shoes and the floor is = 0.6. Determine if the man can move the crate. Part A Determine the force that tends to move the man to the right. Express your answer to three significant figures and include the appropriate units. Part B Determine the magnitude of the maximum force due to friction that opposes the tendency of the man's motion. Express your answer to three significant figures and include the appropriate units. Part C Can he move the crate? Explain your reasoning. 10 of 10 3 ft

Problem 2 (6 points): Blocks A, B and C have weights 50 lb, 25 lb and 15 lb. Block A is tied to wall by a cable. Force P is applied to a cable tied to block B. Coefficient of static friction between blocks A and B is 0.3, between blocks B and C 0.359, between C and ground D is 0.32. a) State the cases of impending motion as the horizontal force P is applied to block B. b) Assuming one of the stated cases of impending motion, draw proper Free Body Diagrams for the assumed case of impending motion. Label the assumed case of impending motion. c) Determine the smallest force P needed to cause impending motion. Justify your answer. d) Determine tension in cable A, from your final answer for the force P. A B D

The uniform 14-ft pole weighs 150 lb. and is supported as shown. Calculate the magnitude of the force P required to move the pole if the coefficient of static friction for each contact location is 0.40. Express your answer in units of lb. 6' A 14' - יך B - P

Problem 8.3 The mine car and its contents have a total mass of 5.1 Mg and a center of gravity at G. The coefficient of static friction between the wheels and the tracks is μ = 0.4 when the wheels are locked. The brakes at both A and B are locked. Part A Find the normal force acting on the front wheels at B. Express your answer to three significant figures and include the appropriate units. Part B Find the normal force acting on the rear wheels at A. Express your answer to three significant figures and include the appropriate units. Part C Does the car move? Explain your reasoning. 10 kN 0.9 m B -0.6 m- .G 5 of 10 -1.5 m- 0.15 m