Rate of loss of potential energy

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Homework Help Overview

The discussion revolves around the calculation of the rate of loss of potential energy in a physics problem, specifically involving gravitational potential energy. The original poster presents their calculations and compares them to an answer key.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster calculates the rate of loss of potential energy and questions the discrepancy with the answer key. Some participants affirm the original poster's calculation, while others explore the possibility of a typographical error in the answer key.

Discussion Status

The discussion is active, with participants providing feedback on the calculations and questioning the accuracy of the answer key. There is no explicit consensus, but multiple interpretations regarding the answer key's correctness are being explored.

Contextual Notes

Participants mention the importance of significant figures in the calculations and consider whether the answer key may have a typographical error regarding the value of 80 W.

songoku
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Homework Statement
Please see below
Relevant Equations
PE = mgh
1678204756709.png


I got answer for (a), which is 0.51 m

For (b), loss of potential energy = 35 x 9.81 x 0.51 = 175 J
Rate of loss of potential energy = 175 J / 1 s = 175 W

But the answer key is 80 W. Where is my mistake?

Thanks
 
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I think your answer of 175 W is correct.
 
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songoku said:
Homework Statement:: Please see below
Relevant Equations:: PE = mgh

But the answer key is 80 W
If one were adhering to the rules of significant figures, your 175 W (175.103048... on my calculator) would round up to 180 W.

Is it possible that the answer key says "180 W" instead of "80 W"?
 
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jbriggs444 said:
If one were adhering to the rules of significant figures, your 175 W (175.103048... on my calculator) would round up to 180 W.

Is it possible that the answer key says "180 W" instead of "80 W"?
Maybe it is a typo, the answer is written 80 W.

Thank you very much TSny and jbriggs444
 
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