PHY Module 2

1. Oct 3, 2011

Twoacross

1. The problem statement, all variables and given/known data

You are doing exercises on a Nautilus machine in a gym to strengthen your deltoid (shoulder) muscles. Your arms are raised vertically and can pivot around the shoulder joint, and you grasp the cable of the machine in your hand 64.0 from your shoulder joint. The deltoid muscle is attached to the humerus 15.0 from the shoulder joint and makes a 12.0 angle with that bone.

I would include pic but link wont let me

If you have set the tension in the cable of the machine to 36.0 on each arm, what is the tension in each deltoid muscle if you simply hold your outstretched arms in place?

2. Relevant equations

3. The attempt at a solution

When I first looked at the diagram, i was confused about the components within the arm, so i tried taking 36.0 N and then testing out the lengths i had and i tried inputting it as a whole but didnt make sense to me.

If anyone can provide assistance, that be awesome!

Thanks
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution