posted by pete .
An athlete at the gym holds a 5.29 kg steel ball in his hand. His arm is 67.0 cm long and has a mass of 4.57 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?
You have to assume a cg for the arm. Assuming midway...
4.57*67/2+5.29*67 in N-cm of torque
What is the magnitude of the torque about his shoulder if he holds his arm straight, but 43.8° below horizontal?
I tried multiplying the torque force by sin43.8 but it was wrong :(