A 100-kg cart is being pushed (at a constant speed a distance of 1 m up an inclined plane 4) that is at an angle of 60° with the horizontal. What is the difference in the work needed if the coefficient of kinetic friction was equal to Hk = 0.20 or zero? (Hint: Draw the free-body diagram for the cart.)

A 50 N force is applied at an angle to the side of a box causing it to slide across a floor. The total work done to move the box 10m is 150 J (joules).  A) what is the angle at which the force was applied?  B) if the box has a weight of 735 N, what is the mass of the box?

The speed of a crate traveling on a horizontal frictional surface changes from vi=13 m/s to vf=11.5 m/s in a distance of d=8.5 m. (A) how long in seconds did it take for the crate to slow by this amount, assuming the acceleration is constant? (B) if the crate has a mass of 1kg, what is the power supplied to the crate by friction? (C) what is the coefficient of kinetic friction between the crate and the surface uk?

A 1000-kg automobile accelerates up a hill, increasing its speed from 5 mi/h to 50 mi/h, along a straight 100-m stretch of road. If the hill makes an angle of 5° with respect to the horizontal, find the total work done by the automobile.

Hk=0.38. If the speed of the block v=7m/s when it leaves the inclined plane, determine the work done by the force of gravity. Take g =9.81m/s² and express your final result using one decimal place. A block of mass m=1.64kg is released from rest at an unknown height h. The coefficient of friction between the block and the incline oriented at an angle of 0=56° is m h т

(a) The Eskimo a 50.0-kg sled over level ground with a force of 1.80  102 N exerted horizontally, moving it a distance of 6.30 m over new terrain. If the net work done on the sled is 1.90  102 J find the coefficient of kinetic friction.(b) Repeat the exercise with the same data, finding the coefficient of kinetic friction, but assume the applied force is upwards at a 35.0° angle with the horizontal.

The figure shows three forces applied to a trunk that moves leftward by 3.08 mover a frictionless floor. The force magnitudes are F-4.89N, F - 8.72N, and F3- 3.12N, and the indicated angle is 0- 60: (a) During the displacement, what is the net work done on the trunk by the three pplied forces, the gravitational furce, and the normal force? (b) Is there a net transfer of energy to or from the trunk? (c) Does the kinetic energy of the trunk increase or decrease? (a) Number i Units (b) k)

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.

You slide a box of books of mass 31 kg at constant speed up a 30°ramp, applying a force of 200 N directed up the slope. The coefficient of kinetic friction is 0.18. (a)How much work have you done when the box has risen 1 m vertically? (b)How much work was done by gravity? (c)How much work was done by friction?(d)What was the net work done on the box? Draw Free body diagram as well

A 2000-kg automobile is driven down an incline. Then the brakes are applied, causing a constant total braking force (applied by the road on tires) of 7 kN. The work done by the weight is _kN m, when the automobile has a displacement of s=6m. (Express the answer to three significant figures and g-9.81m/s²) 5°