MCAS Power Practice
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High school MCAS questions about POWER from released Introductory Physics practice exams.
- 1.The motor of one car is more powerful than the motor of another car. Which of the following must be true of the more powerful motor?
- A.
It can do work more quickly
- B.
It can operate for a longer time
- C.
It can burn fuel more efficiently
- D.
It can store more potential energy
- 2.A crane lifts two 100 kg loads of building materials to the top of a building under construction. The first load is lifted in 10 s and the second load is lifted in 13 s. Which of the following statements BEST compares the work and power expended by the crane lifting the two loads?
- A.
The crane does more work and expends more power for the first lift.
- B.
The crane does the same work and expends the same power for each lift.
- C.
The crane does the same work for each lift but expends more power for the first lift.
- D.
The crane does more work in the second lift but expends the same power for each lift.
- 3.Two students each carry a box up to the third floor of a building. The total mass of each student and the box she is carrying is the same. Roberta makes the trip in 45 s while Mary takes 30 s. Which of the following statements BEST describes this task?
- A.
Roberta does more total work than Mary
- B.
Mary does more total work than Roberta
- C.
Roberta has greater power output than Mary
- D.
Mary has a greater power output than Roberta
- 4.A man ran on a treadmill for 1800 seconds. At the end of his run, the treadmill indicated his energy output as 240,000 J. What average power did he generate?
- A.
666 W
- B.
133 W
- C.
66 W
- D.
7 W
- 5.At a weightlifting competition, two competitors lifted the same weight to the same height. The second competitor accomplished the lift 2 seconds faster than the first competitor. This demonstrated that the second competitor had more
- A.
Energy than the first
- B.
Inertia than the first
- C.
Power than the first
- D.
Work than the first
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