6. A person is rolling their suitcase behind them at an angle of 23 degrees with the floor. The suitcase is pulled 5.0 meters forward. a) What is the work done on the suitcase? b) Suppose the suitcase is pulled for 7.5 seconds, what would be the power from the person? 7. Jenny is pulling a toboggan up an incline of 20 degrees with a force of 15 Newtons. How much work is done if the length of the incline is 5 meters? 8. A 65kg hiker climbs to the top of a 752m high mountain. a) How much work did the hiker do? b) If the path taken by the hiker covers a distance of 1650m, what average force was exerted by the hiker? Gravitational Potential Energy & Kinetic Energy 1. A hoist in an automobile service center raises a 1600kg car 1.8m off the floor. a) Calculate the car's gravitational potential energy relative to the floor. b) How much work did the hoist do on the car to raise it? Ignore friction. 2. A roast of beef in a refrigerator's freezer compartment has a potential energy of 35J relative to the floor. If the roast is 1.7m above the floor, what is the mass of the roast?

6. A person is rolling their suitcase behind them at an angle of 23 degrees with the floor. The suitcase is pulled 5.0 meters forward. a) What is the work done on the suitcase? b) Suppose the suitcase is pulled for 7.5 seconds, what would be the power from the person? 7. Jenny is pulling a toboggan up an incline of 20 degrees with a force of 15 Newtons. How much work is done if the length of the incline is 5 meters? 8. A 65kg hiker climbs to the top of a 752m high mountain. a) How much work did the hiker do? b) If the path taken by the hiker covers a distance of 1650m, what average force was exerted by the hiker? Gravitational Potential Energy & Kinetic Energy 1. A hoist in an automobile service center raises a 1600kg car 1.8m off the floor. a) Calculate the car's gravitational potential energy relative to the floor. b) How much work did the hoist do on the car to raise it? Ignore friction. 2. A roast of beef in a refrigerator's freezer compartment has a potential energy of 35J relative to the floor. If the roast is 1.7m above the floor, what is the mass of the roast?

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College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 60PE: Integrated Concepts (a) Calculate the force the woman in Figure 7.46 exerts to do a push-up at...

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a shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25 below the horizontal. The force is just sufficient to overcome various frictional forces, so the cart moves at constant speed, (a) Find the work done by the shopper as she moves down a 50.0-m length aisle, (b) What is the net work done on the cart? Why? (c) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the work done by frictional forces doesnt change, would the shoppers applied force be larger, smaller, or the same? What about the work done on the cart by the shopper?
a shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25 below the horizontal. The force is just sufficient to overcome various frictional forces, so the cart moves at constant speed, (a) Find the work done by the shopper as she moves down a 50.0-m length aisle, (b) What is the net work done on the cart? Why? (c) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the work done by frictional forces doesnt change, would the shoppers applied force be larger, smaller, or the same? What about the work done on the cart by the shopper?
Give an example of a situation in which there is a force and a displacement, but the force does no work. Explain why it does no work.
Give an example of a situation in which there is a force and a displacement, but the force does no work. Explain why it does no work.
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