(a) Estimate the magnitude of the force f m the
Chapter 12, Problem 12.87(choose chapter or problem)
(a) Estimate the magnitude of the force f m the musclesexert on the back to support the upper body when a personbends forward. Use the model shown in Fig. 12-94b.(b) Estimate the magnitude anddirection of the force Fvacting on the fifth lumbarvertebra (exerted bythe spine below).FIGURE 12-94 87.
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