- #1

SteelDirigibl

- 40

- 0

## Homework Statement

## Homework Equations

So moment and torque are really the same, right? so the force times the distance.

## The Attempt at a Solution

The force used has to be perpendicular to the line of the radius about O, so I assume I must do cos(36)*6lb*5in for the first. The second (the ball) confused me because it's not on the same line, so something must be missing right? or does it not matter?

I see the 54 deg. at the top, but its a little unclear, i assume between the arm and y axis. this is just for center of gravity of arm though, and would need a different angle to find the balls distance from O? or can we pretend it is the same?

I did, found the distance to be 8.899, and for the force it is cos(36)*9*8.899.

Then do you just add the two moments? I got 64.8 for the ball and 24.27 for the arm. added up these are 89.1 lb-in. is this right? and also I guess that should be negative because it is clockwise?

and obviously i can't do the second part until i finish the first, but i'm pretty sure i know how to do that.