Object at rope: work to lift it

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Homework Help Overview

The discussion revolves around a physics problem involving work done to lift an object, specifically an oaken bucket hanging from a rope over a pulley. The subject area includes concepts of work, potential energy, and forces in mechanics.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the force exerted to lift the bucket and questions the relationship between this force and the tension in the rope. Participants discuss the work done in terms of potential energy and express confusion regarding the calculations presented.

Discussion Status

Some participants have provided feedback on the calculations, with one suggesting that the work done appears correct, while another questions the accuracy of the answer provided in the book. There is an ongoing exploration of the problem and its assumptions.

Contextual Notes

Participants are discussing the work done specifically by the original poster, and there is mention of a discrepancy between their calculations and the answer found in a textbook. The original poster's assumptions about the height and potential energy are also under scrutiny.

iwonde
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An old oaken bucket of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and you pull horizontally on the end of the rope to raise the bucket slowly a distance of 4.00 m.

So far, I have:
F = force exerted by me
s = displacement
W_F=F x s

How do I find F? Does it have anything to do with the tension of the rope?
 
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Work done is also the change in potential energy.
 
I'm sorry, I meant to ask for the work done by me.
So,
H= height
H_1 = 0
H_2 = 4m
Work_total = change of potential energy = mg(H_2 - H_1) = 264.6
and W_total = W_me + mgH_1 = 264.6J
W_me = 264.6 J
Did I do something wrong, because it doesn't seem right.
 
Looks Ok to me. What are you having trouble with?
 
The answer in the book is 3.6 J.
 
What was the question in full? Are you sure that's the answer to this question?
 

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