College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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please help with questions 7,8,9,10,11, and 12 altogether please!!! correct answers ?
7. A constant force with a magnitude of 1.9 x 10 newtons is required to keep an automobile having a mass of 1.0 x 10 kilograms moving at a constant speed of 20. meters per second. The work done in moving the automobile a distance of 2.0 x 10 meters is (1) 2.0 x 10 J (2) 3.8 x 10J (3) 2.0 x 10 (4) 3.8 x 10J 8. A student does 300. joules of work pushing a cart 3.0 meters due east and then does 400. joules of work pushing the cart 4.0 meters due north. The total amount of work done by the student is (1) 100. J (2) 500. J (3) 700. J (4) 2500 J 9. A constant horizontal force of 20.0 newtons east applied to a box causes it to move at a constant speed of 4.0 meters per second. Calculate how much work is done against friction on the box in 6.0 seconds. 10. A horizontal force with a magnitude of 3.0 newtons applied to a 7.0-kilogram mass moves the mass horizontally a distance of 2.0 meters. Determine the work done against gravity in moving the mass. 11. A student pulls a block along a horizontal sur- face at constant velocity. The diagram below shows the components of the force exerted on the block by the student. String Block 8.0 N Horizontal m surface 3.0 m Calculate the work done against friction. 12. A total of 8.0 joules of work is done when a constant horizontal force of 2.0 newtons to the left is used to push a 3.0-kilogram box across a counter top. Determine the total horizontal distance the box moves. 6.0 N
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Transcribed Image Text:7. A constant force with a magnitude of 1.9 x 10 newtons is required to keep an automobile having a mass of 1.0 x 10 kilograms moving at a constant speed of 20. meters per second. The work done in moving the automobile a distance of 2.0 x 10 meters is (1) 2.0 x 10 J (2) 3.8 x 10J (3) 2.0 x 10 (4) 3.8 x 10J 8. A student does 300. joules of work pushing a cart 3.0 meters due east and then does 400. joules of work pushing the cart 4.0 meters due north. The total amount of work done by the student is (1) 100. J (2) 500. J (3) 700. J (4) 2500 J 9. A constant horizontal force of 20.0 newtons east applied to a box causes it to move at a constant speed of 4.0 meters per second. Calculate how much work is done against friction on the box in 6.0 seconds. 10. A horizontal force with a magnitude of 3.0 newtons applied to a 7.0-kilogram mass moves the mass horizontally a distance of 2.0 meters. Determine the work done against gravity in moving the mass. 11. A student pulls a block along a horizontal sur- face at constant velocity. The diagram below shows the components of the force exerted on the block by the student. String Block 8.0 N Horizontal m surface 3.0 m Calculate the work done against friction. 12. A total of 8.0 joules of work is done when a constant horizontal force of 2.0 newtons to the left is used to push a 3.0-kilogram box across a counter top. Determine the total horizontal distance the box moves. 6.0 N
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