Quiz: Work, Power And Energy

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 Quiz: Work,Power And Energy
Practice quiz for chapter 7.

  
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Questions and Answers

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  • 1. 
    A solar collector heats the water in the water tank of a home. Which energy transformation equation best describes this situation?
    • A. 

      Radiant --> thermal

    • B. 

      Radiant --> electrical

    • C. 

      Radiant --> gravitational --> electrical

    • D. 

      Radiant --> gravitational --> thermal

    • E. 

      Radiant --> thermal --> electrical


  • 2. 
    The amount of work done when a 80.00-kg person jumps 1.000 m into the air in 0.5000 s is
    • A. 

      292.0 J

    • B. 

      40.00 J

    • C. 

      784.00 J

    • D. 

      1568 J

    • E. 

      160.0 J


  • 3. 
    The amount of work done to stop a bullet travelling through a tree trunk a distance of 50 cm with a force of 2.00 ´ 102 N is
    • A. 

      –4.00 x 102 J

    • B. 

      +4.00 x 102 J

    • C. 

      +1.00 x 102 J

    • D. 

      –1.00 x 102 J

    • E. 

      +1.00 x 104 J


  • 4. 
    A person lifts a pail of water of mass of 1.50 kg from the ground to a deck, 1.00 m above the ground. How much work was done by gravitational force on the pail of water?
    • A. 

      –14.7 J

    • B. 

      +1.50 J

    • C. 

      –1.50 J

    • D. 

      +0.153 J

    • E. 

      +14.7 J


  • 5. 
    In which case is negative work done?
    • A. 

      The work done by Earth on a ball as the ball, which was initially at rest, falls 3.0 m down towards Earth.

    • B. 

      A eastward force is applied to an eastward moving soccer ball that is already moving at a constant velocity to increase its speed in that direction.

    • C. 

      A cart is moving at a constant velocity of 10 m/s [W] when a 0.5 N [downward] force is applied.

    • D. 

      The work done by Earth on an arrow as it is fired 200 m straight up into the air.

    • E. 

      Earth applies a force on the Moon as the Moon travels one completion rotation in orbit around Earth.


  • 6. 
    In which case is positive work done?
    • A. 

      The work done by air resistance on a ball as the ball, which was initially at rest, falls 3.0 m down towards Earth.

    • B. 

      A eastward force is applied to an eastward moving soccer ball that is already moving at a constant velocity to increase its speed in that direction.

    • C. 

      Earth applies a force on the Moon as the Moon travels one completion rotation in orbit around Earth.

    • D. 

      A cart is moving at a constant velocity of 10 m/s [W] when a 0.5 N [downward] force is applied.

    • E. 

      The work done by Earth on an arrow as it is fired 200 m straight up into the air.


  • 7. 
    An elevator motor lifts a load of 2500 kg a height of 12.0 m in 3.00 seconds. The energy required by the motor to accomplish this task is 300 000 J. What is the efficiency of the elevator?
    • A. 

      10.0%

    • B. 

      98.0%

    • C. 

      30.0%

    • D. 

      102%

    • E. 

      8.17%


  • 8. 

    In the following figure, a 0.60-kg ball is about to fall to the step below.  The gravitational potential energy of the ball relative to the step is
    • A. 

      8.8 x 101 J

    • B. 

      2.9 x 101 J

    • C. 

      6.0 x 100 J

    • D. 

      3.0 x 100 J

    • E. 

      5.9 x 101 J


  • 9. 
    Jughead (m = 60 kg), Archie (m = 65 kg), and Reggie (m = 70 kg), all decide to run up a flight of stairs at with a height of 4.0 m at constant speed at good ol’ Riverdale High.  If all three achieve this task in a time of 3.5 seconds, who generates the most power?
    • A. 

      Jughead

    • B. 

      Archie

    • C. 

      Reggie

    • D. 

      They all generate the same amount of power

    • E. 

      Not enough information is provided to answer this question


  • 10. 
    During a recent NBA basketball game, Jose Calderon, a guard with the Toronto Raptors, threw a basketball into the crowd in an unsportsmanlike manner.  Which one of the following statements about the basketball is FALSE?
    • A. 

      As the basketball rises, its kinetic energy decreases

    • B. 

      As the basketball rises, it is accelerated downward

    • C. 

      As the basketball rises, its potential energy increases

    • D. 

      When the basketball reaches the top of its flight, its kinetic energy is zero

    • E. 

      When the basketball reaches the top of its flight, acceleration is still g


  • 11. 
    Nicholas exerts a certain force to lift a dumbell 3.0 m straight above his head in 20 s. If he had completed the same task in 10 s, the energy he would need to use would be
    • A. 

      Twice as great

    • B. 

      The same

    • C. 

      Four times as great

    • D. 

      Half as great

    • E. 

      Cannot be calculated using the given information


  • 12. 
    If Elio pushes against an immobile wall with twice as much force as Jordan, which of the following is TRUE?
    • A. 

      Elio is doing twice as much work as Jordan.

    • B. 

      Elio generates twice as much power as Jordan.

    • C. 

      Elio is doing four times as much work as Jordan.

    • D. 

      No work is being done by Elio or Jordan.

    • E. 

      They both generate power in equal amounts.


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