Can You Help Me Solve This Static Mechanics Problem?

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Homework Help Overview

The discussion revolves around a static mechanics problem involving the calculation of moments and forces. The original poster seeks assistance in understanding the components of a force and how they relate to moments in a mechanical system.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the breakdown of force components and their respective moments. The original poster shares calculations for vertical and horizontal components of a force, along with their contributions to the net moment. Questions arise regarding the correctness of these calculations and the interpretation of subsequent parts of the problem.

Discussion Status

The conversation is ongoing, with participants providing feedback on the original poster's calculations. Some guidance has been offered regarding the definitions and relationships between moments and forces, but there is still uncertainty about the next steps, particularly concerning part b of the problem.

Contextual Notes

There is a reference to specific angles and components in the calculations, which may imply certain assumptions about the setup of the problem. The original poster expresses concern about the accuracy of their results and the requirements for part b, indicating potential gaps in understanding.

bostonfenway
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Hi I can't figure out this problem, can you please help me out?
Thank you so much!

http://imageshack.us/scaled/landing/515/19200619.jpg
 
Last edited by a moderator:
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welcome to pf!

hi bostonfenway! welcome to pf! :wink:

show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 
First step, figure out the components of P.
 
Thank you for the welcome! :)

This is what I have done so far:

Vertical component = Pcos30 = .866P
Moment arm = 200cos40 = 153.2
Moment= 132.7P (ccw)

Horiz. comp. = Psin30 = .5P
Moment arm = 200 sin40 = 128.6
Moment = -64.3P (cw)

Net moment = 68.4P
Moment arm of P = 68.4
 
hi bostonfenway! :smile:

yes that's fine!

(btw, you can check it by seeing it's Pcos20°)

what is worrying you about that? :wink:
 
its right? So the answer to part a is 68.4?
What about part b? That worries me..
 
bostonfenway said:
its right? So the answer to part a is 68.4?

yes :smile:
What about part b? That worries me..​

(b asks for the moment arm)

by definition, the total moment (68.4) equals the total force (200) times the moment arm :wink:
 
Got it! Thanks tiny-tim :)
 

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