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## Homework Statement

If F_1 = 100N , F_2 = 120N and F_3 = 80N , determine the magnitude and coordinate direction angles of the resultant couple moment.

## Homework Equations

M=Fd

M=r x F

M

_{R}=Ʃ(r x F)

## The Attempt at a Solution

I found the couple moment for each force:

M

_{1}=F

_{1}d=100(0.2) or (-20j using right hand rule)

M

_{2}=F

_{2}d=120(0.2) or +24i

M

_{3}=F

_{3}d=80(0.2) or -16k

M

_{4}=this is what im having problems with...not sure how to get the moment for F4... if do 150(.3)(cos30)=38.97 i get the wrong resultant.

The correct answer should be (M

_{C})

_{R}=71.9 Nm...

Any help would be greatly appreciated.