How Do You Find the Sum of Moments at an Angle?

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Homework Help Overview

The discussion revolves around finding the sum of moments in static equilibrium exercises, particularly when forces are applied at angles. The original poster expresses uncertainty about how to approach the problem, especially in relation to a diagram that lacks sufficient information.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the need for additional information regarding the problem setup and question the assumptions about the weight distribution and pivot points. There are mentions of using trigonometry to calculate moments based on perpendicular distances.

Discussion Status

Some participants have offered insights into potential assumptions and methods for calculating moments, while others are seeking clarification on the provided diagram and its accompanying details. The conversation indicates a mix of exploration and clarification without reaching a consensus.

Contextual Notes

The original poster's diagram is noted to be lacking in detail, which may hinder the ability to fully analyze the problem. There is also a suggestion that the weight of the boom and its center of mass should be considered in the calculations.

k31453
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How to Take the sum of moments !

Homework Statement


Hi i am doing static equilibrium exercises in textbook.



Homework Equations


But I don't know how to find sum of moments at P when its come to angle.
This is a drawing
Untitled.png



The Attempt at a Solution



I have No idea ! I was trying to get my head around But still can't Do it !
 
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Well, the diagram attached to the OP doesn't contain enough information anyway. Is there problem text which accompanies the diagram which you haven't supplied? Or are you to assume that the weight of the boom is located at half its length from point P?
 
A couple of reasonable assumptions seem in order here.

To find the moment that a force contributes, you multiply the force by the perpendicular distance to the line of action of that force. So you have the opportunity to demonstrate your skill with trigonometry here. :wink:
 
Last edited:
What Nascent said.

Making reasonable assumptions it seems possible to calculate T. For example T appears to be connected roughly half way up the boom. There is enough info to calculate the perpendicular distances that Nascent refers to. I would assume the boom is very light weight compared to the wrecking ball.
 
Yes, the centre of mass at mid weight and pivot at p.
 
Are you still stuck?
 

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