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Gravitational Potential Energy - Questions II.4.1

  1. Describe the type(s) of energy an object has by placing a checkmark ( ) in the correct column(s).

    Object Kinetic Energy Potential Energy
    Diver at the end of a cliff    
    Acorn falling from a tree    
    Bicycle moving along a level surface    
    Tennis ball moving downward    
    Ice cream float sitting on a counter    

  2. What is the potential energy of an 1100 kg elevator at the top of the SGI building in Regina, 150 m above the street?
  3. An 1800 kg elevator rises a distance of 120 m in 3.0 s.
    1. Calculate the change in its potential energy.
    2. What is the minimum power of the motor that lifts the elevator if the force of friction is ignored?
  4. A ball of mass 0.10 kg is thrown straight up with an initial kinetic energy of 520 J.
    1. What will be the maximum height of the ball?
    2. How long will it take to reach this maximum height?
    3. At maximum height, what is its potential energy relative to
      1. the level from which it was thrown?
      2. a reference point 15 m above the point from which it was thrown?
    1. Determine the total mechanical energy of a 250 g baseball if it has a velocity of 30. m/s when it leaves the pitcher's hand.
    2. If the baseball goes in an arc and has a speed of 22 m/s at its maximum height, what will the maximum height be?
    3. A student lifts a 1.4 kg box from his desk to a counter that is 0.5 m vertically above his desk. Calculate the change in gravitational potential energy of the box.
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