A refrigerator weighing 1500 N is to be lifted onto a truck bed that is 1.0 m ab

Question

A refrigerator weighing 1500 N is to be lifted onto a truck bed that is 1.0 m above the ground. When pushed up a slanting ramp 2.0 m in length a force of only 200 N is required to move it at constant velocity. Comparing the work involved in lifting the refrigerator straight up to the work in pushing it along the ramp, there is less work required when the ramp is employed. more work required when the ramp is employed. an equal amount of work is required in each case. A ball at the end of a string is swinging as a simple pendulum. Assuming no loss in energy due to friction, we can say for the ball that the potential energy is maximum at each end of the motion the mechanical energy changes and is maximum where the kinetic energy is minimum the mechanical energy changes and is maximum where the kinetic energy is maximum. the kinetic energy does not change but the potential energy does. On a frictionless tabletop, a force is applied to an object: the object's velocity is horizontal and the force is perpendicular to the tabletop. Which of the following is true? The applied force is friction. The total energy of the object does not change. There cannot be more than one force on the object. The force does work on the object. Work is done on an object to increase its total energy- Which one of the following is true? The total work done must be equal to the energy lost to heat and sound. Both the kinetic energy and potential energy can be larger. If the potential energy increases, then the kinetic energy must decrease. The object must have a larger speed and smaller height above the ground. If the kinetic energy of an object increases, then the potential energy must decrease. the total energy must increase. there can only be one force on the object. the speed must increase as well. If an object has a larger potential energy than kinetic energy. the speed of the object will increase. the speed of the object will not change. the speed of the object will decrease. it is not possible to predict what the speed will be; it depends on the situation.

Explanation / Answer

(5)

The work done in both cases is equal to the change in potential energy. as the refrigerator is bringing to same height, the change in potential energy that is the work done is same. (velocity is constant in both the cases.)

(6)

option (a) is correct.

(7)

option (B) is correct.

(8)

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