(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I've attached an image. The question states:

Replace the three forces shown, with an equivalent force-couple system at point O(origin).

I've got a little ways, but I am stuck at the couple. I don't know how to use the distance in the couple. Need to know what distance to use, and from where.

2. Relevant equations

R = Fx + Fy

C = Mo = ra/o x Fa + rb/o x Fb + rc/o x Fc(is this correct, or do I use x and y?)---this is the part where I'm stuck.

magnitude C = sqrt(Cx^2 + Cy^2)

3. The attempt at a solution

Fx = 200cos60 + 300cos45 + 250cos30 = 528.6 i

Fy = 200sin60 + 300sin45 - 250sin30 = 260.3 j

R = 528.6 i + 260.3 j

C = Mo = ???

Am I correct up to this point too?

View attachment sample exam1.bmp

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Replace forces with couple

**Physics Forums | Science Articles, Homework Help, Discussion**