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Rigid Bodies: finding the moment about a point

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Date Posted: 10/23/2007 7:55:10 PM  Status: Live
Rigid Bodies: finding the moment about a point
Course Textbook Chapter Problem
Classical Mechanics Vector Mechanics for Engineers: Statics and Dynamics (8th) by Beer, Johnston, Eisenberg 3 26P
Question Details:
A wooden board AB, which is used as a temporary prop tp support a small roof, exerts at point A of the roof a 228-N force directed along BA. Determine the moment about C of that force.
 
I don't undetstand how to compute the moment at C.

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Date Posted: 10/24/2007 4:31:21 AM  Status: Live
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Date Posted: 1/26/2008 9:35:09 PM  Status: Live
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Response:
There is a typo in the solution for this problem:  for the r, it should be:
.96i - .12j + .72k instead of -.72k, however the rest of the problem is worked out correctly from there, and the solution that I got is the same as the solution listed, just a small typo in the r


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Date Posted: 7/17/2008 3:28:48 PM  Status: Live
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Response:
another typo is the BA. the j should be -1.8, not +1.8, for the vector is heading down. [ -1.92- (-.12) ]= -1.92+.12 = -1.8



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