# 19 which of the following is the rate at which work

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19. Which of the following is the rate at which work isdone?a. potential energyc. mechanical energyb. kinetic energyd. power20. Which of the following equations isnotequation for power,P,in terms of work,displacement,d,time interval, Δt,force,F,and/orvelocity,v?potential energy of 1265 J.anW,21. Which of the following arenotunits of power?22. How much power is required to lift a 2.0 kg massat a speed of 2.0 m/s?Solution:23. What is the average power supplied by a 60.0 kgperson running up a flight of stairs a vertical distanceof 4.0 m in 5 s?a. 480 Wb. 240 Wc. 120 Wd. 48 WSolution:24. Which of the following has the greatest poweroutput?25. A more powerful motor can do26. An object has a mechanical energy of 1575 J and apotential energy of 1265 J.
WORK-POWER- ENERGY EXTRA CREDIT WORKSHEETName:27. A 5 kg object is moving downward at a speed of 12m/s. If it is currently 2.6 m above the ground what isits mechanical energy?28. Calculate the kinetic energy of a 750 kg compactcar moving at 50 m/s.29. Julie has a mass of 49 kg. What is her potentialenergy when standing on the 6 meter diving board?(She is 6 meters above the water.) Julie jumps off thediving board.a. What is her kinetic energy just before she hits thewater?b. What is Julie’s speed just as she hits the water?30. A spring is compressed 10 cm from the restposition. If the elastic potential energy stored in thespring is 1.5 J, what is the spring constant?
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Rachel, Julie, C SAM