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Chapter 10: Interactions and Potential Energy

Expert-verified
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Pages: 231 - 260

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87 Questions for Chapter 10: Interactions and Potential Energy

  1. Object Ais stationary while objects BandCare in motion. Forces from object Ado10Jof work on object Band–5Jof work on object C. Forces from the environment do 4Jof work on object Band8Jof work on object C. Objects BandCdo not interact. What are ∆Ktotand∆U

    Found on Page 255
  2. Upon what basic quantity does kinetic energy depend? Upon what basic quantity does potential energy depend?

    Found on Page 255
  3. A 20 kg child is on a swing that hangs from 3.0-m-long chains. What is her maximum speed if she swings out to a 45° angle?

    Found on Page 256
  4. A process occurs in which a system’s potential energy decreases while the system does work on the environment. Does the system’s kinetic energy increase, decrease, or stay the same? Or is there not enough information to tell? Explain.

    Found on Page 255
  5. A 1500 kg car traveling at 10 m/s suddenly runs out of gas while approaching the valley shown in FIGURE EX10.11. The alert driver immediately puts the car in neutral so that it will roll. What will be the car’s speed as it coasts into the gas station on the other side of the valley?

    Found on Page 256
  6. A process occurs in which a system’s potential energy increases while the environment does work on the system. Does the system’s kinetic energy increase, decrease, or stay the same? Or is there not enough information to tell? Explain.

    Found on Page 255
  7. The maximum energy a bone can absorb without breaking is surprisingly small. Experimental data show that the leg bones of a healthy, 60 kg human can absorb about 200 J. From what maximum height could a 60 kg person jump and land rigidly upright on both feet without breaking his legs? Assume that all energy is absorbed by the leg bones in a rigid landing

    Found on Page 256
  8. FIGURE Q10.12is the energy bar chart for a firefighter sliding down a fire pole from the second floor to the ground. Let the system consist of the firefighter, the pole, and the earth. What are the bar heights of Wext, Kf

    Found on Page 255
  9. a. If the force on a particle at some point in space is zero, must its potential energy also be zero at that point? Explain.

    Found on Page 255
  10. A cannon tilted up at a 300angle fires a cannon ball at 80m/sfrom a top a 10-m-high fortress wall. What is the ball’s impact speed on the ground below?

    Found on Page 256

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