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20. An 845-N sled is pulled a distance of 185 meters. The task requires 1.20 x 104 J of work and is done by pulling on a rope with a force of 125-N. At what angle is the rope held?

20. An 845-N sled is pulled a distance of 185 meters. The task requires 1.20 x 104 J of work and is done by pulling on a rope with a force of 125-N. At what angle is the rope held?

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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11. An airplane passenger carries a 215 newton suitcase up stairs, a displacement of 4.20 meters vertically and 4.60 meters horizontally. How much work does the passenger do? a. 215 N X 4.70m =903 The same passenger carries the same suitcase hack doun the camG stairs, How much work does b. the passenger do now? 75 Nx4. oY CO (8o 903.J Co 180 = 12. A rope is used to pull a metal box 15.0 meters across the floor, The rone is held at an angle of 46.0° with the floor and a force of 628 newtons. How much work doeş the force (tension) on the rope do? D= 15 m E- 678N 13. Which requires more work, carrying a 420-N knapsack up a 200 meter high hill or carrying a 210-N knapsack up a 400 meter high hill? Why? di= Z00 Fi dz=400. Fz =210N 14. Lee pushed horizontally with a 80-N force on a 20-kg mass 10 meters 628 NX 15.0m X Cos (46.0 W= 6540 J they both done some work since woyk is direetty Propotromal 84,000N w= gt oooN c of work Lee did. d= lom amount 8o NXl om w= G 2 oss a floor. Calculate to F= 80N 15. The third floor of a house is 8.0 meters above street level, How much work is needed to move a 150- kilogram refrigerator to the third floor? g-9.81mls 150×9.81メ 8 11772J 16. Stan does 176 J of work lifting himself 0.300 m. What is Stan's mass? m=150 K9 W= 176 J 176N- F F=586.666 N 586.666 9.8m/s? m=59.8639 Kg 17. A crane lifts a 2.25 x 103-N bucket containing 1.15 m3 of soil to a height of 7.50 meters. Calculate the work the crane performs. 18. Mike pulls a sled across level snow with a force of 225-N along a rope that is 35.0° above the horizontal. If the sled moved a distance of 65.3 meters, how work did Mike do? り-(5.ア。 レ=7637.15 J 725x 65.3 CoS35 .Z25 x65 3 x0.819 Angle =35o 19. Karen has a mass of 57.0 kilograms and she rides up an escalator at Woodly Park Station of the Washington D.C. Metro. Karen rode a distance of 65.0 m, the longest escalator in the free world. How much work did the escalator do on Karen if it has an inclination of 30.0°? 20. An 845-N sled is pulled a distance of 185 meters. The task requires 1.20 x 104 J of work and is done by pulling on a rope with a force of 125-N. At what angle is the rope held? 21. Chris carried a carton of milk, weight 10-N, along a level hall to the kitchen, a distance of 3.50 meters. How much work did Chris do? 22. A 4200-N piano is to be slid up a 3.5-m frictionless plank that makes an angle of 30.0° with the horizontal. Calculate the work done in sliding the piano up the plank?
Transcribed Image Text:11. An airplane passenger carries a 215 newton suitcase up stairs, a displacement of 4.20 meters vertically and 4.60 meters horizontally. How much work does the passenger do? a. 215 N X 4.70m =903 The same passenger carries the same suitcase hack doun the camG stairs, How much work does b. the passenger do now? 75 Nx4. oY CO (8o 903.J Co 180 = 12. A rope is used to pull a metal box 15.0 meters across the floor, The rone is held at an angle of 46.0° with the floor and a force of 628 newtons. How much work doeş the force (tension) on the rope do? D= 15 m E- 678N 13. Which requires more work, carrying a 420-N knapsack up a 200 meter high hill or carrying a 210-N knapsack up a 400 meter high hill? Why? di= Z00 Fi dz=400. Fz =210N 14. Lee pushed horizontally with a 80-N force on a 20-kg mass 10 meters 628 NX 15.0m X Cos (46.0 W= 6540 J they both done some work since woyk is direetty Propotromal 84,000N w= gt oooN c of work Lee did. d= lom amount 8o NXl om w= G 2 oss a floor. Calculate to F= 80N 15. The third floor of a house is 8.0 meters above street level, How much work is needed to move a 150- kilogram refrigerator to the third floor? g-9.81mls 150×9.81メ 8 11772J 16. Stan does 176 J of work lifting himself 0.300 m. What is Stan's mass? m=150 K9 W= 176 J 176N- F F=586.666 N 586.666 9.8m/s? m=59.8639 Kg 17. A crane lifts a 2.25 x 103-N bucket containing 1.15 m3 of soil to a height of 7.50 meters. Calculate the work the crane performs. 18. Mike pulls a sled across level snow with a force of 225-N along a rope that is 35.0° above the horizontal. If the sled moved a distance of 65.3 meters, how work did Mike do? り-(5.ア。 レ=7637.15 J 725x 65.3 CoS35 .Z25 x65 3 x0.819 Angle =35o 19. Karen has a mass of 57.0 kilograms and she rides up an escalator at Woodly Park Station of the Washington D.C. Metro. Karen rode a distance of 65.0 m, the longest escalator in the free world. How much work did the escalator do on Karen if it has an inclination of 30.0°? 20. An 845-N sled is pulled a distance of 185 meters. The task requires 1.20 x 104 J of work and is done by pulling on a rope with a force of 125-N. At what angle is the rope held? 21. Chris carried a carton of milk, weight 10-N, along a level hall to the kitchen, a distance of 3.50 meters. How much work did Chris do? 22. A 4200-N piano is to be slid up a 3.5-m frictionless plank that makes an angle of 30.0° with the horizontal. Calculate the work done in sliding the piano up the plank?
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