he force P = 150 N is applied to the 50-kg crate, which is stationary before the force is applied. Take ? = 30 Coefficient of static friction ?? = 0.3 and coefficient of kinetic friction ?? = 0.25 Determine the magnitude of the normal force, which is acting on the box. Express your answer in N to three significant figures. Do not include the unit

he force P = 150 N is applied to the 50-kg crate, which is stationary before the force is applied. Take ? = 30 Coefficient of static friction ?? = 0.3 and coefficient of kinetic friction ?? = 0.25 Determine the magnitude of the normal force, which is acting on the box. Express your answer in N to three significant figures. Do not include the unit

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.90RP: The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The...

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The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The coefficient of static friction between the rail and the rein is 0.6. If a 34-lb force acting on the bridle is sufficient to restrain the horse, determine the smallest safe length L for the free end of the rein.
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The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The coefficient of static friction between the threads is 0.4. Determine (a) the torque C0 that must be applied to the screw in order to produce a 28-lb clamping force at A; and (b) the torque required to loosen the clamp.
Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair is denoted by G. The coefficient of static friction is 0.2 at B (the contact point between the chairs) and 0.35 at A, C, and D. Determine the smallest force P that would cause sliding.
The screw of the carjack has a pitch of 0.1 in. and a mean radius of 0.175 in. Note that the ends of the screw are threaded in opposite directions (right- and left-handed threads). The coefficient of static friction between the threads is 0.08. Calculate the torque C0 that must be applied to the screw in order to start the 1200-1b load moving (a) upward; and (b) downward.
The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.
The man having a weight of 200 lb pushes horizontally on the crate as shown in the photo. The coefficient of static friction between the 450-lb crate and the floor is μs = 0.3 and between his shoes and the floor is μ's = 0.6. Determine if the man can move the crate. Solve the parts below. 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. 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.
6. The crate in Figure 3.7 has a mass 350 kg and is subjected to a towing force P acting at an angle 01 = 20° with the horizontal. If the coefficient of static friction is 0.5, determine the magnitude of P to just start the crate moving down the plane. 02 = 10° Figure 3.7 P=986.61N
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