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Chapter 7: Work, Energy and Energy Resources

College Physics (Urone)
Pages: 225 - 264

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94 Questions for Chapter 7: Work, Energy and Energy Resources

  1. The force exerted by a diving board is conservative, provided the internal friction is negligible. Assuming friction is negligible, describe changes in the potential energy of a diving board as a swimmer dives from it, starting just before the swimmer steps on the board until just after his feet leave it.

    Found on Page 258
  2. Consider the following scenario. A car for which friction is not negligible accelerates from rest down a hill, running out of gasoline after a short distance. The driver lets the car coast farther down the hill, then up and over a small crest. He then coasts down that hill into a gas station, where he brakes to a stop and fills the tank with gasoline. Identify the forms of energy the car has, and how they are changed and transferred in this series of events. (See Figure 7.34.)

    Found on Page 258
  3. Describe the energy transfers and transformations for a javelin, starting from the point at which an athlete picks up the javelin and ending when the javelin is stuck into the ground after being thrown.

    Found on Page 259
  4. Boxing gloves are padded to lessen the force of a blow.

    Found on Page 262
  5. Do devices with efficiencies of less than one violate the law of conservation of energy? Explain

    Found on Page 259
  6. Using energy considerations, calculate the average force a 60.0-kg sprinter exerts backward on the track to accelerate from 2.00 to 8.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him.

    Found on Page 262
  7. List four different forms or types of energy. Give one example of a conversion from each of these forms to another form.

    Found on Page 259
  8. A hydroelectric power facility (see Figure 7.38) converts the gravitational potential energy of water behind a dam to electric energy.

    Found on Page 260
  9. List the energy conversions that occur when riding a bicycle.

    Found on Page 259
  10. (a) How much gravitational potential energy (relative to the ground on which it is built) is stored in the Great Pyramid of Cheops, given that its mass is about7×109kgand its center of mass is 36.5m above the surrounding ground?

    Found on Page 261

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