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Find the moment about the and axis

  • Thread starter Colts
  • Start date
  • #1
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1. Homework Statement
http://session.masteringengineering....bs._454_55.jpg [Broken]
Find the moment about the axis AC. F=<7,12,-6>


2. Homework Equations
MomentAC = Uac dotted with (Rab X F)
Uac is the unit vector from a to c


3. The Attempt at a Solution
Uac=<.8,.6,0>
Rab=<4,3,-2>
F=<7,12,-6>
Rab X F =<6,-10,0>
MomentAC=4.8-6
=-1.2
MomentAC*Uac=<-.96,-.72,0>
 
Last edited by a moderator:

Answers and Replies

  • #2
6,054
390
The link to the picture is garbage.
 
  • #4
6,054
390
How did you compute Rab x F? I get a different result.
 
  • #5
77
0
(-6(3)-(-2)12)-(-6(4)-7(-2))+(7(12)-7(3))
(-18+24)-(-24+14)+(48-21)
6,10,27
 
  • #6
6,054
390
This is different fro what you had before, and this is what I get as well. You just need to do the scalar product now.
 

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