How Do You Solve for Force B in Rigid Body Equilibrium?

[jesuslovesu]

Homework Statement

http://img66.imageshack.us/img66/9317/inlinelt8.th.jpg

The Attempt at a Solution

Sorry, By and B should be in lbs, not lbft
http://img141.imageshack.us/img141/9320/pictarsp4.th.jpg

My work just shows how I attempted to find the force B. According to my book, the force B should be 2140 lb.

I'm really not sure if I handled the incline (force B) correctly. I know it's supposed to be perpendicular to the point of contact.

Does anyone see where I went wrong? As far as I can tell, the width of the beam (1.2ft) isn't important for finding any of the vector components.

 

[Doc Al]

Looks like you neglected the torque due to the horizontal component of force B. (That's where the beam width will come in.)