A truck hitched to a trailer exerts a horizontal net force of 312 Newtons. If the trailer moves a total distance of 1235 meters, how much work was dome by the truck? No unit is required for the final answer.
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- Starting from rest, a 5.40-kg block slides 3.40 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is µ, = 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?a rope applies a hortizontal force of 180 N to pull a crate a distance of 2 m across a floor. A frictional force of 120 N opposes this motion. What is the total work done on the crate?A person pulls a toboggan for a distance of 36.5 m along the snow with a rope directed 30.6 ° above the snow. The tension in the rope is 96.1 N. (a) How much work is done on the toboggan by the tension force? (b) How much work is done if the same tension is directed parallel to the snow?
- A 4.8 kg box has an acceleration of 1.8 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 97.5-kg man pushes a crate 4.5 m up along a ramp that makes an angle of 17.5° with the horizontal. He exerts a force of 495 N on the crate parallel to the ramp and moves it at a constant speed. Calculate the work, in joules, that the man performs to cause the crate and himself to move up the ramp.. A box with a mass of 3.00 kg is pushed a distance of 2.0 m by a horizontal force of 12.0 N across a frictionless table. Determine the work done by: a) the applied force b) the normal force c) the force of gravity d) the net force on the block
- Part A: If you lift a 10 kg object that weighs 10 N (22lbs.) from the floor and place it on a table 1.5 m high, how much work did you do and how much potential energy did you give the object? Assume no friction. Part B: You apply 10N force to an object for 10m, how much work did you do and how much kinetic energy did you give the object? Assume no friction.(a) A block with a mass m is pulled along a horizontal surface for a distance x by a constant force at an angle ? with respect to the horizontal. The coefficient of kinetic friction between block and table is μk. Is the force exerted by friction equal to μkmg? If not, what is the force exerted by friction? (Assume ? is measured above the horizontal.) This answer has not been graded yet. (b) How much work is done by the friction force and by ? (Don't forget the signs. Use the following as necessary: F for the magnitude of , g, m, x, ? and μk.) Wfk = WF = (c) Identify all the forces that do no work on the block. (Select all that apply.) cos(?)m sin(?)friction k (d) Let m = 2.00 kg, x = 4.40 m, ? = 3.2°, F = 15.5 N, and μk = 0.400, and find the answers to parts (a) and (b). (Include appropriate signs.) fk = N WF = J Wfk =An electric elevator with a motor at the top has a multistrand cable weighing 4 Ib / ft. When the car is at the first floor, 140 ft of cable are paid out, and effectively 0 ft are out when the car is at the top floor. How much work does the motor do just lifting the cable when it takes the car from the first floor to the top? The amount of work required is ft-lb. (Simplify your answer.)