14. Lee pushed horizontally with a 80-N force on a 20-kg mass 10 meters across a floor. Calculate to amount of work Lee did.

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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.
a. How much work does the passenger do?
215N X 4.70m
= 903 J
b. The same passenger carries the same suitcase back down the same stairs. How much work does
the passenger do now? z15 NY4,20X cos 180
Cos 180 =-
woo903 J
12. A rope is used to pull a metal box 15.0 meters across the floor. The rope is held at an angle of 46.0° with
the floor and a force of 628 newtons, How much work does the force (tension) on the rope do?
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?
14. Lee pushed horizontally with a 80-N force on a 20-kg mass 10 meters across a floor. Calculate to
amount of work Lee did.
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?
16. Stan does 176 J of work lifting himself 0.300 m. What is Stan's mass?
17. A crane lifts a 2.25 x 10-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?
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 10“ 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. a. How much work does the passenger do? 215N X 4.70m = 903 J b. The same passenger carries the same suitcase back down the same stairs. How much work does the passenger do now? z15 NY4,20X cos 180 Cos 180 =- woo903 J 12. A rope is used to pull a metal box 15.0 meters across the floor. The rope is held at an angle of 46.0° with the floor and a force of 628 newtons, How much work does the force (tension) on the rope do? 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? 14. Lee pushed horizontally with a 80-N force on a 20-kg mass 10 meters across a floor. Calculate to amount of work Lee did. 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? 16. Stan does 176 J of work lifting himself 0.300 m. What is Stan's mass? 17. A crane lifts a 2.25 x 10-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? 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 10“ 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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