Work and Mechanical Energy Quiz
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Questions and Answers

What is the kinetic energy of the 50.0 g cannon shell traveling at 700 m/s?

  • 350000 J
  • 9800 J
  • 245000 J
  • 1715000 J (correct)
  • How much work is done in raising 100.0 kg for a potential difference of 196 N/kg?

  • 19600 J (correct)
  • 9800 J
  • 490 J
  • 39200 J
  • For what potential difference must a 400 kg pile driver fall to do 15,000 J of work?

  • 300 m
  • 150 m
  • 37.5 m (correct)
  • 75 m
  • How much work is needed to stop a 1400 kg truck traveling at 100 km/h?

    <p>490000 J</p> Signup and view all the answers

    What average braking force is required to stop a 2 tonne truck traveling at 80 km/h in 200 m?

    <p>160 kN</p> Signup and view all the answers

    In the given scenario, what is the kinetic energy of the mass $m$ when it reaches the surface?

    <p>$KE_{surface} = mgh$</p> Signup and view all the answers

    What does the equation $KE_{surface} + PE_{surface} = KE_{height h} + PE_{height h}$ represent?

    <p>Conservation of mechanical energy</p> Signup and view all the answers

    What is the work done by the external force (gravitational attraction) on the mass $m$?

    <p>$W = PE_{surface} - PE_{height h}$</p> Signup and view all the answers

    What assumption is made about the gravitational field strength in the given scenario?

    <p>It is constant</p> Signup and view all the answers

    Which assumption is made about the kinetic energy of the Earth in the given scenario?

    <p>It can be assumed to be negligible</p> Signup and view all the answers

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