# Need Help In Getting Started

1. Oct 18, 2004

### Double A

In my statics class we are studying Rigid body equilibrium and when it got to 3D I get a little lost. Below are some homework questions I'm having a hard time starting. I get the free body diagrams but don't know where to go from there. I find that there are more unknowns than I have equations for.

I have provided links for the reactions that happen at certain types of connections. I also apologize for the bad scanning job on a couple of the images.

Reactions:
http://herograw.com/reactions1.JPG [Broken]
http://herograw.com/reactions2.JPG [Broken]

Questions:
http://herograw.com/5-80.JPG [Broken]
http://herograw.com/5-84.JPG [Broken]
http://herograw.com/5-96.JPG [Broken]

I appreciate any help. I need to finish this assignment asap.

Last edited by a moderator: May 1, 2017
2. Oct 18, 2004

### NateTG

Are you remembering to account for Torque?

3. Oct 18, 2004

### Double A

I am accounting for moments (tourque). The 6 equations that I have to use are:

1) Force Equations:
-$$\Sigma F x =0$$
-$$\Sigma F y =0$$
-$$\Sigma F z =0$$

2) Moment Equations
-$$\Sigma M x =0$$
-$$\Sigma M y =0$$
-$$\Sigma M z =0$$