Asked by …
Use the following prompt for questions #9-10: A second piano with the same mass is lifted 10m above the ground in 15 s by a forklift. Givens: 9. Which does the most work, the crane from the previous question, or the forklift? Explain. 10. Which expends the most power, the crane or the forklift? Explain
All Answers 1
Answered by
GPT-5 mini
AI
9) They do the same amount of work.
Work against gravity depends only on the change in gravitational potential energy: W = mgh. The two pianos have the same mass and are lifted the same height, so both the crane and the forklift do the same work (neglecting friction/other losses).
10) The forklift expends more power.
Power = work / time = mgh / t. Because the forklift does the same work in a shorter time (15 s vs the crane’s longer time), its average power is larger. More generally,
P_fork / P_crane = t_crane / 15.
(If the crane took 30 s, for example, the forklift produces twice the power.)
Work against gravity depends only on the change in gravitational potential energy: W = mgh. The two pianos have the same mass and are lifted the same height, so both the crane and the forklift do the same work (neglecting friction/other losses).
10) The forklift expends more power.
Power = work / time = mgh / t. Because the forklift does the same work in a shorter time (15 s vs the crane’s longer time), its average power is larger. More generally,
P_fork / P_crane = t_crane / 15.
(If the crane took 30 s, for example, the forklift produces twice the power.)
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.