Redo Example 9–9, assuming now that the person is less bent over so that the $30 ^\circ$ in Fig. 9–14b is instead $45 ^\circ$. What will be the magnitude of $F_V$ on the vertebra?
Figure 9-71 Forces on the back exerted by the back muscles ($F_M$) and by the vertebrae ($F_V$) when a person bends over.
Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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