A 556-kg trailer is hitched to a truck. Find the work done by the truck on the trailer in each of the following cases. Assume rolling friction is negligible. The trailer is pulled at constant speed along a road inclined at 14.2° for 2.39 km.

A 68.3-kg skier coasts up a snow-covered hill that makes an angle of 25.5 ° with the horizontal. The initial speed of the skier is 9.77 m/s. After coasting a distance of 1.45 m up the slope, the speed of the skier is 3.60 m/s. (a) Find the work done by the kinetic frictional force that acts on the skis. (b) What is the magnitude of the kinetic frictional force? (a) Number i (b) Number i Units Units 0

Calculate the work done on a 1500-kg elevator car by its cable to lift it 40.0 m at constant speed, assuming friction averages 2000 N. 6.68 x 105 J 5.08 x 105 J 5.92 x 105 J 1.4 x 105 J

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Several children are on a sled pulled by a four-wheeler across a level snow-covered field. The sled is moving at a constant speed of 9.25 m/s, and the tow rope (parallel to the ground) makes an angle of 35.0°, with respect to the velocity of the sled (see the figure below). a 35.0⁰ 1170 If the tension in the rope is 49.0 N, determine the work done (in J) on the sled by the tension in the rope in 10.5 s. J

The figure here shows an overhead view of three horizontal forces acting on a cargo canister that was initially stationary but that now moves across a frictionless floor. The force magnitudes are F₁ = 2.60 N, F₂= 3.60 N, and F3 = 10.0 N, and the indicated angles are 02 = 49.0° and 93 = 30.0°. What is the net work done on the canister by the three forces during the first 3.90 m of displacement? 8₂ 03 Number i 11 Unit J

The figure below shows an overhead view of three horizontal forces acting on a cargo canister that was initially stationary but that now moves across a frictionless floor. The force magnitudes are F1 = 3.10 N, F2 = 4.10 N, and F3 = 20.0 N, and the indicated angles are 02 = 50.0° and 03 = 34.0°. What is the net work done on the canister by the three forces during the first 4.00 m of displacement? Additional Materials

A man returning from ice fishing trip pulls a sled with fish. Total mass of the sled and  fish is 50.0 kg. (b) Suppose the coefficient of kinetic friction between sled and snow is 0.20. The man pulls the sled 5.0 m by exerting a force of 120 N at 0°. Find the work done by force of frictional.

Suppose the ski patrol raises a rescue sled and victim, having a total mass of 85.0 kg, up a ? = 62.0° slope at constant speed, as shown in the figure. DO NOT USE THE ANGLE SHOWN IN THE FIGURE! USE THE ANGLE IN THE PROBLEM STATEMENT ABOVE. The coefficient of friction between the sled and the snow is 0.130.   Calculate the normal force on the sled (in N).   Calculate the work done (in J) by the force of friction as the sled moves 30.0 m up the hill. (Hint: Think about the direction of the friction force. Should it be different than the direction shown in the figure?).   Calculate the work done (in J) by the tension force in the rope on the sled over this distance. Calculate the work done (in J) done by the force of gravity on the sled over this distance.

A 62.7-kg skier coasts up a snow-covered hill that makes an angle of 20.4 ° with the horizontal. The initial speed of the skier is 8.61 m/s. After coasting a distance of 2.21 m up the slope, the speed of the skier is 4.14 m/s. (a) Find the work done by the kinetic frictional force that acts on the skis. (b) What is the magnitude of the kinetic frictional force?