Chapter 10, Problem 8Q

Figure l0-25b shows an overhead view of a horizontal bar that is rotated about the pivot point by two horizontal forces. ${\stackrel{\to }{F}}_1$ and ${\stackrel{\to }{F}}_2$ with ${\stackrel{\to }{F}}_2$ at angle ϕ to the bar. Rank the following values of ϕ according to the magnitude of the angular acceleration of the bar, greatest first: 90°, 70°, and 110°.

Figure 10-25 Questions 7 and 8.