Chapter 3, Problem 15P

The helicopter view in Fig. P3.15 shows two people pulling on a stubborn mule. The person on the right pulls with a force ${\stackrel{\to }{F}}_1$ of magnitude 120 X and direction of θ₁ = 60.0°. The person on the left pulls with a force ${\stackrel{\to }{F}}_2$ of magnitude 80.0 N and direction of θ₂ = 75.0°. Find (a) the single force that is equivalent to the two forces shown and (b) the force that a third person would have to exert on the mule to make the resultant force equal to zero. The forces are measured in units of newtons (symbolized N).

Figure P3.15