I. In developing guidelines for lifting objects in the work place environment, t

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I. In developing guidelines for lifting objects in the work place environment, the Occupational Safety and Health Administration (OSHA) has set an upper limit for compressive forces on a spinal segment. In this problem, you will ultimately determine if the person shown below is exceeding that limit, but for now you need to find the unknown muscle force. Given: Body moment arm (Lw) = 250 mm Object moment ann (Lp) = 400 mm Erector spinae moment arm (Ltd) = 50 mm P = 50 N W = 500 N Flexion angle (theta) = 35 degrees a) Determine the force (M) of the erector spinae muscle necessary for this task.

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