Unit: work and energy
Year: 1994 Question#: 18
Question: The diagram below shows a 1.0 x 103 newton crate to be lifted at constant speed from the ground to a loading dock 1.5 meters high in 5.0 seconds. What power is required to lift the crate?
(1 ) 1.5 x 103 W
(2 ) 2.0x 102 W
(3 ) 3.0 x 102 W
(4 ) 7.5 x 103 W
What is this question really asking?
Explanation by: Chad H
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Answer 1
1.5 x 103 W
Incorrect
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Answer 2
2.0 x 102 W
Incorrect
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return to top Answer 3
3.0 x 102 W
correct
You correctly used
and remembered that the force and the change in displacement have to be parallel
to each other.return to top
Answer 4
7.5 x 103 W
Incorrect
Try using
return to top What's this question really asking?
At what rate is work being done in this situation? return to top
