Equilibrim Physics Problems – Solve Now!

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Homework Help Overview

The discussion revolves around a physics problem related to rotational equilibrium, specifically involving the application of forces on a bar with negligible mass. Participants are exploring how to determine the distance from a point where a force must be applied to achieve equilibrium.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the conditions for rotational equilibrium, including the balance of moments and the application of forces. There are attempts to set up equations based on the problem statement, and some participants question the correctness of the initial attempts and the methodology used.

Discussion Status

Some guidance has been offered regarding the proper consideration of moments and the signs associated with them. There is an ongoing exploration of different interpretations of the problem, particularly concerning the setup of the equations and the assumptions made about the forces involved.

Contextual Notes

Participants are reminded to show their attempts and relevant equations as part of the forum rules. There is an indication that the original poster may not have fully adhered to these guidelines, prompting requests for clarification and further attempts.

gnarrr
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Hi gnarrr, welcome to PF.
Please go through the rules of the PF.
Don't post the problems alone. Show your attempts. List the relevant equations. Still if you don't get, we will help you.
 
The first one

Homework Statement



Consider the bar to have negligible mass. How far from point 'A' must a downward force of 40.5 N be applied in order to achieve rotational equilibrium.

Homework Equations


T1=T2
F=0

The Attempt at a Solution



5x9.8x2.1 + 3.5x9.8x4.3 + 40.5xd = 0
d=6.18m
 
i figured out the second one
 
First on is wrong.
If you want to take the moment about the fulcrum, you have to consider clockwise and counterclockwise moments and use proper sings.
If you want to take the moments about A, 40.5 N and 3.5 kg produce clockwise moment and the reaction due to all the forces on the fulcrum will produce the counterclockwise moment. Equate them to get d.
 

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