Another Statics problem with friction

[ME_student]

Homework Statement

Two 10* wedges of negligible weight are used to move and position the 400-lb block. Knowing that the coefficient of static friction is 0.25 at all surfaces of contact, determine the smallest force P that should be applied as shown to one of the wedges.

Homework Equations

I broke the 400lb block with wedge touching it up from the wedge on the ground. I've got two FBD's I analyzed. Considering the 400lb block I summed forces in y to find Fn2. Then I considered the wedge to find P.

The Attempt at a Solution

The attachment has my solution. P should be 313lb I got 273lb.

 

[ME_student]

I figured this out long ago. The term is officially over. Thanks though!I was analyzing the top wedge wrong. I forgot about the force normal to the wall and the friction force against the wall.