A 1,000-W motor powers a hoist used to lift cars at a service station.(a) How much time would it take to raise a 2,400-kg car 2 m?(b) If the original motor is replaced with one rated at 3,000 W, how long would it take to complete this task?

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A 1,000-W motor powers a hoist used to lift cars at a service station. (a) How much time would it take to raise a 2,400-kg car 2 m? S (b) If the original motor is replaced with one rated at 3,000 W, how long would it take to complete this task? S

A 1,000-W motor powers a hoist used to lift cars at a service station. (a) How much time would it take to raise a 2,400-kg car 2 m? S (b) If the original motor is replaced with one rated at 3,000 W, how long would it take to complete this task? S

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 2PE: A 75.0-kg person climbs stairs, gaining 2.50 meters in height. Find the work done to accomplish this...

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Question

A 1,000-W motor powers a hoist used to lift cars at a service station.
(a) How much time would it take to raise a 2,400-kg car 2 m?
(b) If the original motor is replaced with one rated at 3,000 W, how long would it take to complete this task?

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KEY TERMS 1. work (4.1) 2. joule 3. foot-pound 4. energy (4.2) 5. kinetic energy 6. potential energy 7. gravitational potential energy 8. conservation of total energy (4.3) 9. conservation of mechanical energy 10. power (4.4) 11. watt 12. horsepower 13. kilowatt-hour 14. alternative energy sources (4.6) 15. renewable energy sources For each of the following items, fill in the number of the appropriate Key Term from the preceding list. o. _____ The ability to do work
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