Elevator Problem: 10700 Joules Lifts 3900N by 9 Ropes

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Homework Help Overview

The problem involves a pulley system used to lift an elevator weighing 3900 Newtons, utilizing 9 ropes. The input work of 10700 joules is to be analyzed to determine how far the elevator can be lifted, assuming a frictionless system.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the work formula and questions how to incorporate the number of ropes into their calculations. Some participants suggest using the weight of the elevator directly, while others question the relevance of the 9 ropes.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of how the pulley system affects the calculations. There is no explicit consensus, but some guidance has been offered regarding the use of the elevator's weight.

Contextual Notes

Participants note the lack of information regarding acceleration, which contributes to the uncertainty in their calculations. The role of the 9 ropes in the context of the problem is also under discussion.

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A system of pulleys is used to lift an elevator that weighs 3900 Newtons. The pulley system uses 9 ropes to support the load. How far would 10700 joules of input work lift the elevator? Assume the pulley system is frictionless.

Homework Equations


w=fd
f=ma
w=mg

The Attempt at a Solution


w=fd
10700=fd
and so i tried to solve for f using f=ma...i found m using w=mg (3900=m*9.81=397.55) but we're not given the acceleration so I'm stuck!
 
Last edited:
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You have the weight of the elevator. So f=3900N? Try that.
 
then what do i do with the 9 because there are 9 ropes?
...maybe multiply it??
 
nvm i got it...you just ignore the 9 ropes
 

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