A rope is used to pull a 3.98 kg block at constant speed 6.99 m along a horizontal floor. The force on the block from the rope is 5.35 N and directed 20.1° above the horizontal. What are (a) the work done by the rope's force, (b) the increase in thermal energy of the block-floor system, and (c) the coefficient of kinetic friction between the block and floor? (a) Number Units (b) Number i Units (c) Number Units >
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Q: the coefficient of kinetic friction between the block and floor?
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- A tension force of 165 N inclined at 25.0° above the horizontal is used to pull a 39.0 kg storage crate a distance of 4.10 m on a rough surface. If the crate moves at a constant speed, find (a) the work done by the tension force and (b) the coefficient of kinetic friction between the crate and surface. (a) the work done by the tension force (in J) (b) the coefficient of kinetic friction between the crate and surfaceA 36.0 kg box initially at rest is pushed 5.45 m along a rough, horizontal floor with a constant applied horizontal force of 150 N. If the coefficient of friction between box and floor is 0.300, find the following. (a) the work done by the applied force (b) the increase in internal energy in the box-floor system due to friction (c) the work done by the normal force (d) the work done by the gravitational force (e) the change in kinetic energy of the box (f) the final speed of the box m/sA block of mass mm is released from rest on a ramp that is inclined at an angle θθ from the horizontal. The coefficient of kinetic friction between the block and the ramp is μkμk. The block slides a distance dd along the ramp until it reaches the bottom. How much work is done on the block by the force of gravity? Express your answer in terms of mmm, θθtheta, ddd, ggg, and μkμkmu_k. b) How much work is done on the block by the friction force? Express your answer in terms of mmm, θθtheta, ddd, ggg, and μkμkmu_k. c) Use the work-energy theorem to find the speed of the block just as it reaches the bottom of the ramp. Express your answer in terms of mmm, θθtheta, ddd, ggg, and μkμkmu_k.
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- A 3.7-kg block is pushed 3.3 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of 0 = 30° with the horizontal, as shown in the figure below. If the coefficient of kinetic friction between block and wall is 0.30, determine the following. (a) the work done by F (b) the work done by the force of gravity (c) the work done by the normal force between block and wall (d) By how much does the gravitational potential energy increase during the block's motion?A 325 N force is pulling on an 85.0 kg refrigerator as it slides across a horizontal floor. The force acts at an angle of 25.0° above the horizontal surface of the floor. The coefficient of kinetic friction between the refrigerator and the floor is 0.150, and the refrigerator moves a distance of 5.50 m. Find (a) the work done by the pulling force, (b) the work done by the force of kinetic friction, (c) the net amount of work done on the refrigerator, and (d) if the refrigerator was initially at rest determine the speed of the refrigerator after the 5.50m displacement. (e) Include a force (or free-body) diagram of the situation. ]A 7.80-g bullet moving at 530 m/s penetrates a tree trunk to a depth of 4.50 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.
- A 7.80-g bullet moving at 470 m/s penetrates a tree trunk to a depth of 6.50 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment in stops moving.Starting from rest, a 4.70-kg block slides 3.40 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is = 0.436. (a) Determine the work done by the force of gravity. (b) Determine the work done by the friction force between block and incline. (c) Determine the work done by the normal force. (d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height?F A 2.3 kg block is moved at constant speed over a surface for which the coefficient of kinetic friction is 0.26. The displacement is 6 m. It is pushed by a force directed at 34 degrees below the horizontal as shown in the figure above. Find the work done on the block by: a) the force; a) friction; a) gravity.