Back Stress Refer to Exercise 77. (a) Suppose a 200-lb
Chapter 5, Problem 78(choose chapter or problem)
Back Stress Refer to Exercise 77. (a) Suppose a 200-lb person bends at the waist so that u = 45_. Estimate the force exerted on the persons back muscles. (b) Approximate graphically the value of u that results in the back muscles exerting a force of 400 lb.
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