Asked by Amelie
You observe someone pulling a block of mass 48 kg across a low-friction surface. While they pull a distance of 3.0 m in the direction of motion, the speed of the block changes from 4.9 m/s to 7.7 m/s.
Calculate the magnitude of the force exerted by the person on the block.
This I figured out using moment principle and the position update formula. 282 N.
What was the change in internal energy (chemical plus thermal) of the person pulling the block?
How do I get this? I know that DEtot = q + W, I can find W and Kinetic energy. but what other energies would be included in Ei and Ef?
Calculate the magnitude of the force exerted by the person on the block.
This I figured out using moment principle and the position update formula. 282 N.
What was the change in internal energy (chemical plus thermal) of the person pulling the block?
How do I get this? I know that DEtot = q + W, I can find W and Kinetic energy. but what other energies would be included in Ei and Ef?
Answers
Answered by
Amelie
Also, I know the rest energies would cancel out.
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