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Old Jun 20th 2013, 01:19 AM   #1
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statics(Momentum) problem

the force acts in the plane of triangle ABC , where A(2,3) ,B(1,-4) ,C(-1,0)
If moment about A = moment about B = 60 and moment about C =-60
Find vector F and its magnitude >>
this is my attempt ....
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<img src="http://im36.gulfup.com/RyhxH.jpg" width=400 height=400>

Is this correct?
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Last edited by mido22; Jun 20th 2013 at 01:23 AM.
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Old Jun 20th 2013, 10:00 AM   #2
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Looks good right up to the end. Your values for L and M are the x and y values for vector F, respectively, but instead of writing F=(L,M) you wrote F=(M,L). You can see quite easily that the direction of F as you've written it is not parallel to AB because of the reversed values of x and y components. However the calculation of the magnitude of F is good.
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Old Jun 22nd 2013, 01:26 PM   #3
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thanks very much for your help
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Old Jun 24th 2013, 07:17 AM   #4
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You're welcome! By the way I notice that you used the word "momentum" in the subject title of this thread, but of course what you meant is "moment."
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