Homework Help: physics

Posted by rose on Thursday, November 11, 2010 at 7:02pm.

A person bends over, and lifts an object of mass m = 28.5 kg while keeping the back parallel with the floor. The muscle that attaches 2/3 of the way up the spine maintains the position of the back. This muscle is called the back muscle or latissimus dorsi muscle. The angle between the spine and the force
T
in this muscle is è = 10°. Use the balance of torques and forces in the simplified graph shown in part (b) of the attached figure and take the mass of the upper body as M = 42 kg.

Find the x-component of the compressive force
R
in the spine. Hint: In the figure, W1 is the weight of the object being lifted and W2 is the weight of the upper body.

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