# Homework Help: Resultant and Moment

1. Oct 14, 2007

### sourlemon

1. http://img460.imageshack.us/img460/4458/egrfm3.gif [Broken]
Convert the system of forces to an equivalent single resultant force and a corresponding couple at C. Find the projection of the couple at C along a line adjoining DE. Sketch the system.

2. Equations related.
Fr = F$$_{1}$$ + F$$_{2}$$ + F$$_{3}$$
M = r x F

3. Attempt at the problem.
Is this correct?
Fy = F$$_{3}$$ - F$$_{1}$$
Fx = 0
Fz = F$$_{2}$$

Then find Fr = $$\sqrt{Fy^{2} + Fx^{2} + Fz^{2}}$$

M = r x F.

So does that mean I draw a perpendicular line from C to the line of D and E.

Last edited by a moderator: May 3, 2017