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2. A block 4kg in mass rests on a horizontal plane. What value of horizontal force is required to (a) move the block, (b) maintain the motion of the block once it is moved? The coefficients of static and kinetic friction are 0.23 and 0.18, respectively. What will the force be, if the force is instead applied 25° above the horizontal?

2. A block 4kg in mass rests on a horizontal plane. What value of horizontal force is required to (a) move the block, (b) maintain the motion of the block once it is moved? The coefficients of static and kinetic friction are 0.23 and 0.18, respectively. What will the force be, if the force is instead applied 25° above the horizontal?

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Calculate the magnifude of the force if the coefficienf of kinefic fricfion between the block and floor is 0.20. 3. A man pushes a block of mass 20 kg so that it slides at constant velocity up a ramp that is inclined at 11°. V = k 7 of 8 Calculate the magnitude of the force parallel to the incline applied by the man if a) the incline is frictionless; b) the 20 kg coefficient of kinetic friction between the block and incline is 0.25. NEWTON'S SECOND LAW: 1. A 15 kg load of bricks hangs from one end of a rope that passes over small, frictionless pulley. A 28 kg counterweight is to be suspended from other end of the rope. The system is released from rest. a) draw two free the body What is diagrams, one for the load of bricks and one for the counterweight. b) the magnitude of the upward acceleration of the load of bricks? c) the tension in the rope? What is 2. Block A has a mass of 4.0 kg , and block B has a = 2 m/s? В mass 12.0 kg. The coefficient of kinetic friction between block B and the horizontal surface is Hg = 0.25 0.25. a) What is the mass of block C if block B is moving to the right and speeding up with an acceleration 2 m/s2? b) what is the tension in each cord when block B has this acceleration? EVALUATE 1. A 25kg wooden plate is held in place by two strings attached to the ceiling and the wall. The string attached to the ceiling makes an angle 40° with the horizontal and the string attached to the wall makes 90° with the wall. Determine the force in each string. 2. A block 4kg in mass rests on a horizontal plane. What value of horizontal force is required to (a) move the block, (b) maintain the motion of the block once it is moved? The coefficients of static and kinetic friction are 0.23 and 0.18, respectively. What will the force be, if the force is instead applied 25° above the horizontal? 3. A block has a mass of 6kg and rest initially on a plane inclined at 35°. What value of force is required to stop the block from sliding if (a) the plane is frictionless, (b) the plane has coefficients of fractions static and kinetic equal to 0.20 and 0.18 respectively? What will the value of the force be if the velocity is constant and is directed upward parallel the incline? 4. In the figure, blocks A and B have masses 40 kg and 20 kg, respectively. (a) Detemine the minimum weight of block C to keep A from sliding. The static and kinetic coefficient of frictions between block A and the table are 0.18 and 0.15, 20 respectively. (b) What is the acceleration of block A? 5. A block of mass 5 kg starts to slide down a frictionless plane, inclined at 25° as shown in figure 2. The block moves from rest at the top. The length of the incline is m. Find (a) the acceleration of the block, and (b) its speed when it reaches the bottom of the inclined. 2.0 125
Transcribed Image Text:Calculate the magnifude of the force if the coefficienf of kinefic fricfion between the block and floor is 0.20. 3. A man pushes a block of mass 20 kg so that it slides at constant velocity up a ramp that is inclined at 11°. V = k 7 of 8 Calculate the magnitude of the force parallel to the incline applied by the man if a) the incline is frictionless; b) the 20 kg coefficient of kinetic friction between the block and incline is 0.25. NEWTON'S SECOND LAW: 1. A 15 kg load of bricks hangs from one end of a rope that passes over small, frictionless pulley. A 28 kg counterweight is to be suspended from other end of the rope. The system is released from rest. a) draw two free the body What is diagrams, one for the load of bricks and one for the counterweight. b) the magnitude of the upward acceleration of the load of bricks? c) the tension in the rope? What is 2. Block A has a mass of 4.0 kg , and block B has a = 2 m/s? В mass 12.0 kg. The coefficient of kinetic friction between block B and the horizontal surface is Hg = 0.25 0.25. a) What is the mass of block C if block B is moving to the right and speeding up with an acceleration 2 m/s2? b) what is the tension in each cord when block B has this acceleration? EVALUATE 1. A 25kg wooden plate is held in place by two strings attached to the ceiling and the wall. The string attached to the ceiling makes an angle 40° with the horizontal and the string attached to the wall makes 90° with the wall. Determine the force in each string. 2. A block 4kg in mass rests on a horizontal plane. What value of horizontal force is required to (a) move the block, (b) maintain the motion of the block once it is moved? The coefficients of static and kinetic friction are 0.23 and 0.18, respectively. What will the force be, if the force is instead applied 25° above the horizontal? 3. A block has a mass of 6kg and rest initially on a plane inclined at 35°. What value of force is required to stop the block from sliding if (a) the plane is frictionless, (b) the plane has coefficients of fractions static and kinetic equal to 0.20 and 0.18 respectively? What will the value of the force be if the velocity is constant and is directed upward parallel the incline? 4. In the figure, blocks A and B have masses 40 kg and 20 kg, respectively. (a) Detemine the minimum weight of block C to keep A from sliding. The static and kinetic coefficient of frictions between block A and the table are 0.18 and 0.15, 20 respectively. (b) What is the acceleration of block A? 5. A block of mass 5 kg starts to slide down a frictionless plane, inclined at 25° as shown in figure 2. The block moves from rest at the top. The length of the incline is m. Find (a) the acceleration of the block, and (b) its speed when it reaches the bottom of the inclined. 2.0 125
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