
College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:Common misconceptions about energy:
(With Explanation)
1. Energy is truly lost in many energy transformations. (No
energy is lost, its just transferred)
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- a bucket of water is raised from the bottom of a well to the top in 20 seconds. it took 5000 j to lift the bucket. How much power was expended? A.) 250 W B.) 400 W C.) 10,000 W D.) 200Warrow_forward2. A car moving east with a speed vo has kinetic energy Ko. If the same car moves west with a speed 2vo, its kinetic energy will be (a) Ko (b) 2Ko (c) -2Ko (d) 4Ko (e) -4Koarrow_forward1arrow_forward
- 4.) Worker 1 lifts a mass M1=30kg straight up a distance of 4 meters in 9 seconds. Worker 2 lifts a mass M2 = 15kg straight up a distance of 3 meters is 2 seconds. Determine: a.) Which worker did more work? b.) Which worker developed more power?arrow_forwardQUESTION 5 Which of the following statements about energy is not true? The mechanical energy of a physical system is constant when the forces acting on the system are all conservative forces. a. O b. According to the work-energy theorem, the forces that contribute to the net work include all the conservative and nonconservative forces. c. The total energy of the universe is always conserved. O d. Energy can change form, but it cannot be created or destroyed. O e. Mechanical energy is always conserved ONHarrow_forwardA car accelerates from 10 km/hr to 40 km/hr, how much does its kinetic energy change? a) KE doubles, b) KE quadruples, c) KE increases eightfold, d) KE is cut in half, or e) you would need to know the mass of the car to determine the change in KE.arrow_forward
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