Compute the muscle force and disk compressive force for two different lifting methods. Which method is safer to lift?

a. Muscle (erector spinae) moment arm is 2 in.
b. Weight of the box is 40 lbs.
c. Horizonal moment-arm (from lumbar spine to the box) for the first and second methods are 20 inch and 18 inch, respectively.

answer; (arch); good luck

explanation:

newton's third law, for every action there is an equal and opposite reaction.

dopamine..

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compass can be used day and night, cloudy or sunny