A horizontal force of P = 100 N is just sufficient to hold the crate from sliding down the plane, and a horizontal force of P = 320N is required to just push the crate up the plane.30°Part ADetermine the coefficient of static friction between the plane and the crate.ANSWER:Us%3DPart BFind the mass of the crate.Express your answer with the appropriate units.ANSWER:m =

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A horizontal force of P = 100 N is just sufficient to hold the crate from sliding down the plane, and a horizontal force of P = 320 N is required to just push the crate up the plane. Part A Determine the coefficient of static friction between the plane and the crate. ANSWER: Part B Find the mass of the crate. Express your answer with the appropriate units. ANSWER: m =

A horizontal force of P = 100 N is just sufficient to hold the crate from sliding down the plane, and a horizontal force of P = 320 N is required to just push the crate up the plane. Part A Determine the coefficient of static friction between the plane and the crate. ANSWER: Part B Find the mass of the crate. Express your answer with the appropriate units. ANSWER: m =

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 7.71P: The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If...

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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 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 160 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool.
The weight of the motorcycle is 151 kg and the weight of the driver is 64 kg. Dimensions: l1 = 0,31 m and l2 = 0,23 m Determine the required frictional force.
The system is used to lift a block with mass 300 kg. If the friction coefficient between twoblocks, and between a block and a surface, are 0.20 and 0.35, respectively, what is the minimum force Prequired such that the object is about to be lifted? Assume weights of the blocks to be negligiblecompared to lifted weight. (g=9.81)
A man attempts to support a stack of books horizontally by applying a compressive force of F = 120 N to the ends of the stack with his hands. If each book has a mass of 0.95 kg, determine the greatest number of booksthat can be supported in the stack. The coefficient of static friction between his hands and a book is (μs)h = 0.6 and between any two books (μs)b = 0.4.
Box A weighs 1000N and has a height of H1=3m and width W1=2m. Box B weighs 800N. the static friction coefficient between the boxes is uA=0.7 and the static friction coefficient between box B and the ramp is uB=0.5. Find the max allowable angle for the following instances where no motion occurs, box A and B remain stationary. 1) Box A slides, Box B remains stationary 2) Box A tips, Box B remains stationary 3) Box B slides, Box A remains stationary on block B
Two hemispheres having an inner radius of 2 ft and wall thickness of 0.25 in. are fitted together, and the inside pressure is reduced to -10 psi. If the coefficient of static friction is ms = 0.5 between the hemispheres, determine (a) the torque T needed to initiate the rotation of the top hemisphere relative to the bottom one, (b) the vertical force needed to pull the top hemisphere off the bottom one, and (c) the horizontal force needed to slide the top hemisphere off the bottom one.
A body of mass 30 kg is resting on a horizontal plane. A pull of 80 N is subjected on the body and tends the body to move. Will the body move if coefficient of friction between the body and the plane is 0.3.
A vertical force P exerted on a lever AB holds a 20 kg mass M from falling, as shown in Fig 9-42. The coefficient of friction between the lever and the 300 mm drum is 1/4. Neglect the mass of the drum and lever, and determine the force P to hold the mass. Give soulution. (ans. P = 327 N)
A 85-kg man starts climbing a ladder that leans against a wall as shown in Figure Q1. If the ladder is 5 m long and weighs 10 kg. Determine how far up the ladder the man can climb (in m) before the ladder starts to slip if the coefficient of friction is 0.25 at the top vertical surface and 0.4 at the bottom horizontal surface.
Two bodies is connected in point C, are supported by rigid underlay at an angle α. F is the force acting on right body. We are considering the weight of bodies G and the friction between the bodies and the underlay. Length of bodies l=2000mm.    G1= 160 N, G2= 180 N, α = 30° Find:  1.) Find the magnitude of the force so that it slips on the underlay 2.) Draw the dependence of the force F as a function of the coefficient of friction f (in the range 0-0.5)
A 20 kg block is held in place on an incline plane as shown by a rope that passesover a frictionless pulley at B and then over a fixed cylinder at C where thecoefficient between the rope and the fixed cylinder is 0.2. Given an angle ofincline, A = 25°, if a force of P = 200 V is applied to the end of the rope,(a) Will the block move if the coefficient of static friction between the block and theinclined surface is M, = 0.56?(b)If impending motion exists, will the block tip or slip?