Homework Help: Tension or Compression

1. Oct 4, 2008

tonald

The figure shows a weight W supported by two light rigid rods P and Q. The rods are smoothly hinged to the wall and mounted in the same vertical plane. Which rod is in compression , is in tension?

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2. Oct 4, 2008

Staff: Mentor

Show what you've done so far and where you got stuck.

3. Oct 4, 2008

tonald

I can't think anything....
Actually, compression means the force towards the wall?

4. Oct 4, 2008

Staff: Mentor

"Compression" means that there's an inward force pushing on the ends of the rod; "tension" means there's an outward force on the rod.

This is a problem in static equilibrium.

5. Oct 4, 2008

tonald

Can you show me how to solve this question...
I really can't solve it
or please give me some hints to guide me to finish it ,thanks...

6. Oct 4, 2008

tiny-tim

Welcome to PF!

Hi tonald! Welcome to PF!

Hint: use good ol' Newton's second law on the peg (or whatever it is) where the two rods meet …

it isn't moving, and there are three forces on it, so they … ?