# Quiz: Work, Power And Energy

12 Questions  I  By Songj2
Practice quiz for chapter 7.

Changes are done, please start the quiz.

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