Can You Help Me Solve This Static Mechanics Problem?

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The discussion revolves around solving a static mechanics problem involving moments and forces. The user, bostonfenway, seeks assistance in understanding the calculations for vertical and horizontal components of force P, as well as the net moment. After sharing initial calculations, the user confirms that the answer for part a is 68.4. The conversation emphasizes the relationship between total moment and moment arm, clarifying the user's concerns about part b. The exchange concludes with reassurance that the calculations are correct.
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
 
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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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