Solving Static Structure: Find Forces in B & C

[TSN79]

The attachment shows a structure. I'm supposed to calculate the forces in the members B and C. I try the following:

$$\sum M _A = BL + 2CL - F \cdot {3 \over 2}L = 0$$

$$\sum {F_Y = B + C - F = 0}$$

Solving for B and C from this doesn't yield the correct answer, which is B=3F/10 and C=6F/10.

Can someone explain?

 

[Cyrus]

Please post homework problems in the homework help section.

As for your problem, it looks as if point C is free floating. So there is no force developed at C. Hope that solves your worries.