# Statics question

1. Aug 12, 2010

### Ry122

[PLAIN]http://img38.imageshack.us/img38/6997/forces99.jpg [Broken]

I'm unsure how to go about solving this. There's 4 unknowns. Ax Ay Cx and Cy but isn't there only 2 equations (sum of forces in x and y direction are equal to 0) that can be created in this situation?

Last edited by a moderator: May 4, 2017
2. Aug 12, 2010

### vela

Staff Emeritus
The net moment on each strut should be 0 as well.

3. Aug 12, 2010

No, there are two unknowns, the forces A and C at the supports. There are two equations. Every one of your "unknowns" must be written in terms of A and C (i.e. their projections onto the x and y-axis).

4. Aug 15, 2010

### simianmirror

I am also stuck on this question. any hints would be much appreciated :)

5. Sep 7, 2010

### pongo38

Draw the triangle of forces for joint B

6. Sep 8, 2010

### pongo38

You have two additional equations. One relates Ax and Ay. The other relates Cx and Cy. Can you sketch in the expected directions of the reactions?