A box with a mass of 45.0 kg is pushed with a horizontal force of 150 N. The box moves at a constant speed across a level, rough floor a distance of 5.70 m. (a) What is the work done (in J) by the 150 N force? (b) What is the coefficient of kinetic friction between the box and the floor?
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- A horizontal force of 150 N is used to push a 41.5-kg packing crate a distance of 5.20 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N forceJ(b) the coefficient of kinetic friction between the crate and the surfaceA man pulled a 19.0 kg object 15.0 cm vertically with his teeth. (a) How much work (in J) was done on the object by the man in this lift, assuming the object was lifted at constant velocity? (Include the sign of the value in your answer.) (b) What total force (in N) was exerted on the man's teeth during the lift? (Enter the magnitude.)A box with a mass of 37.0 kg is pushed with a horizontal force of 150 N. The box moves at a constant speed across a level, rough plane a distance of 5.15 m. (a) What is the work done (in J) by the 150 N force? (b) What is the coefficient of kinetic friction between the box and the plane?
- A 156-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 29.1° below the horizontal. The coefficient of kinetic friction is 0.244. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force is zero?A 5.0 kg mass is initially at rest on a horizontal frictionless surface when a horizontal force along an x axis is applied to the block. The force is given by , where the force in in newtons, x is in meters, and the initial position of the block is x = 0. (a) What is the work done in moving the block from x = 1.0 m to x = 2.0 m? (b) What is the maximum kinetic energy of the block between x = 0.0 m and x = 2.0 m?A 3.7-kg block is pushed 2.3 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 120 kg cart is moved on horizontal floor by a force of 124 N, to a distance of 50 m. (a) Calculate the work done on the cart, assuming there if no friction between the cart and the floor. (b) If the floor is rough (with kinetic frictional coefficient of 0.3 between floor and the cart), what is the frictional force on the cart ? (c) Now assume the 124 N force is used to move the cart to a 50 m distance on the rough surface described in part (b). What is the net amount of work done on the cart? (d) If the cart was initially at rest, what is its speed at the end of 50 m movement?After being pushed (no matter what force) an object with mass 100 kg covers a distance of 15 m before stops because a frictional force of 20 N, what is the work done by that force? Caution: consider the friction acting in opposite direction of motion. Hint: Work consider all the acting forces.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 4.8 kg box has an acceleration of 1.6 m/s? when it is pulled by a horizontal force across a surface with 4, = 0.50. Find the work done over a distance of 22 cm by the following forces. (Enter your answers in joules.) (a) the horizontal force (b) the frictional force (c) the net work (d) What is the change in kinetic energy of the box?A person pushes a 15.3-kg shopping cart at a constant velocity for a distance of 36.2 m on a flat horizontal surface. She pushes in a direction 21.8 ° below the horizontal. A 50.5-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force that the shopper exerts? Determine the work done by (b) the pushing force, (c) the frictional force, and (d) the gravitational force.Starting from rest, a 5.50-kg block slides 2.40 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is ?k = 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?