Rigid Body Equilibrium Question

[aldee11]

Hi, I have a question regarding Equilibrium problems.
Here is the example of my hw.
Find the tension T in each cable and the magnitude and direction of the force exerted on the strut by the pivot.
I know how to find T. The only problem is i couldn't imagine the force exerted on the strut by the pivot. I don't even know what that means. Can someone explain it to me and help me solve this problem.

I also noticed that i need to find the force on the pivot for some other problems. Is there any easy ways to find the force? at least, how to picture it. Once i know where it is, i think i could solve it.

 

[aldee11]

nobody??

 

[TVP45]

Draw a free body diagram for each joint.

 

[aldee11]

Draw a free body diagram for each joint.

I know how to do it, the only problem is i don't know how to determine the net force on the pivot.
thats it. that's my only problem. I know how to solve T, but I don't know how to solve the net force exerted on the strut by the pivot

 

[TVP45]

OK. The diagram does not show a pivot where the strut meets the wall, but I assume that is supposed to be a pivot? In that case the strut is always in either pure tension or compression since you cannot transmit torque at either end. So, the force exerted on/by the strut at the upper right (where the two cables are) must be balanced by a force at the pivot. Do you have that force at the upper right?

 

[aldee11]

I need this force exerted by the wall.

 

[TVP45]

Yes, I understand. Do you have the FBD solved at the upper right?