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.
Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.