Chapter 6, Problem 22P

GO In Fig. 6-23, a sled is held on an inclined plane by a cord pulling directly up the plane. The sled is to be on the verge of moving up the plane. In Fig. 6-28, the magnitude F required of the cord’s force on the sled is plotted versus a range of values for the coefficient of static friction µ_s between sled and plane: F₁ = 2.0 N, F₂ = 5.0 N, and µ₂ = 0.50. At what angle θ is the plane inclined?

Figure 6-28 Problem 22.