What is the Torque Produced by a Beam and Sign on a Wall?

  • Thread starter Thread starter _wolfgang_
  • Start date Start date
  • Tags Tags
    Sign Wall
Click For Summary

Homework Help Overview

The problem involves calculating the torque produced by a uniform beam and a sign mounted on a wall. The beam has a specified mass and length, and the sign also has a defined mass. Participants are tasked with determining the total torque about the pivot point where the beam is attached to the wall.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the torque using the formula torque = F x perpendicular distance, considering the beam and sign separately. Some participants question the accuracy of the course book's answer and suggest it may contain errors.

Discussion Status

The discussion is ongoing, with participants exploring potential discrepancies between the original poster's calculations and the course book's answer. Some guidance has been offered regarding the possibility of errors in the book, but no consensus has been reached regarding the correct answer.

Contextual Notes

There is mention of a potential error in the course book, with participants noting that the wording may differ from what they have. The original poster's calculations are based on the assumption that the beam and sign are treated as point masses at their respective centers of mass.

_wolfgang_
Messages
23
Reaction score
0

Homework Statement



a uniform 2kg horizontal beam is 50cm long is bolted to a wall and supports a 5kg sign. calculate the tourqe produced by the combined weight of the beam and the sign about where it is mounted to the wall.

Homework Equations



tourqe = F x Perpendicular distance

The Attempt at a Solution



So I am using the wall as the pivot point making the distance to the centre of mass of the beam 0.25m.

the tourqe of the beam= (9.8x2)x(0.25)
= 4.9Nm

The tourqe of the sign= (9.8x5)x(0.5)
=24.5Nm

And to get the total tourqe i have added these togther to get 29.4Nm

But my course book says the answer is 118Nm?? i know this is a pretty simple question but i can't pick up my error :confused:
 
Physics news on Phys.org
looks like a book error, if you described the problem correctly.
 
the only thing i changed from the book is that it says a light rather than a sign.. but i think it may be a book error to. This book has many errors
 
Well, one error is that it is a torque :biggrin:
 
you never know the book might spell it that way to?!??
 

Similar threads

Does distance affect torque in hanging sign problem?
  • · Replies 42 ·
2
Replies
42
Views
4K
Sign hanging from massless beam attached to hinge supported by string
  • · Replies 10 ·
Replies
10
Views
3K
Calculating tension in a wire holding beam against wall
  • · Replies 2 ·
Replies
2
Views
7K
Archived Hanging a sign Torque and summation of forces
  • · Replies 1 ·
Replies
1
Views
6K
What is the torque on the bolt due to the worker and the weight of the beam?
  • · Replies 1 ·
Replies
1
Views
2K
Torque for a hanging sign. Finding Tension
  • · Replies 2 ·
Replies
2
Views
11K
Force Acting on Hinge: 2744 N Torque on Beam Homework: Find Force on Hinge
  • · Replies 6 ·
Replies
6
Views
2K
What is the total torque of that system?
  • · Replies 28 ·
Replies
28
Views
3K
Min Friction Factor to Maintain Angle of Beam on Wall: 60°
  • · Replies 6 ·
Replies
6
Views
2K
Torque and rotational equilibrium question
  • · Replies 6 ·
Replies
6
Views
4K