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Chapter 9: Work and Kinetic Energy

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Pages: 206 - 230

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103 Questions for Chapter 9: Work and Kinetic Energy

  1. Which has the larger kinetic energy, a 10 g bullet fired at500 m/s or a 75 kg student running at 5.5 m/s?

    Found on Page 227
  2. A sprinter accelerates from rest. Is the work done on the sprinter positive, negative, or zero? Explain

    Found on Page 227
  3. A spring has an unstretched length of 10 cm. It exerts a restoring force F when stretched to a length of 11 cm.

    Found on Page 227
  4. The left end of a spring is attached to a wall. When Bob pulls on the right end with a 200 N force, he stretches the spring by 20 cm. The same spring is then used for a tug-of-war between Bob and Carlos. Each pulls on his end of the spring with a 200 N force.How far does the spring stretch? Explain

    Found on Page 227
  5. The driver of a car traveling at 60 mph slams on the brakes, and the car skids to a halt. What happened to the kinetic energy the car had just before stopping?

    Found on Page 227
  6. The motor of a crane uses power P to lift a steel beam. By what factor must the motor’s power increase to lift the beam twice as high in half the time?

    Found on Page 227
  7. At what speed does a 1000 kg compact car have the same kinetic energy as a 20,000 kg truck going 25 km/h?

    Found on Page 227
  8. A mother has four times the mass of her young son. Both are running with the same kinetic energy. What is the ratio vson /vmother of their speeds?

    Found on Page 227
  9. A horizontal rope with 15 N tension drags a 25 kg box 2.0 m to the left across a horizontal surface. How much work is done by(a) tension and (b) gravity

    Found on Page 227
  10. A 25 kg box sliding to the left across a horizontal surface is brought to a halt in a distance of 35 cm by a horizontal rope pulling to the right with 15 N tension. How much work is done by (a) tension and (b) gravity?

    Found on Page 227

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