Chapter 7, Problem 22P

A crate weighing W = 500 N is pushed against an incline $\left(\theta =20°\right)$ with a force of $F_{\alpha }=100\text{N}$ as shown in Fig. P7.21. The forces $F_f$ and N satisfy the following s stem of equations:

$0.9397F_f+100=0.342N$ $(7.126)$ $0.9397N+0.342F_f-500=0$ . $(7.127)$ Solve parts (a)-(c) of problem P7-21 for system of equations given by (7.126) and (7.127).