Question: 4. Compute the muscle force (lb) for the lifting method. Muscle (erector spinae) moment arm is 2 in. Weight of the box is 40 lbs.

4. Compute the muscle force (lb) for the lifting method. Muscle (erector spinae) moment arm is 2 in. Weight of the box is 40 lbs. Horizonal moment arm (from lumbar spine to the box) is 20 inch

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