- #1
alex7298
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Homework Statement
2 problems.
1: A man lifts a 91kg person straight up a distance of 1.2m in 0.51s. What power is used to do this?
2: 3.00x10^2kg piano is lifted at a steady velocity from ground to a height of 10.0m. The crane doing the lifting has a steady power of 4.00x10^2W. What time does it take to do this?
Homework Equations
Both equations should be able to use P=Fd/t
The Attempt at a Solution
With both problems, the book states constant velocity so the F=ma=0, which doesn't make sense because that would make the answer 0.
Is there another way of finding force that i am forgetting?
Thanks