$4.$ Given: A large steel roller with a mass of $700$ kg is held in position on a smooth incline by a compression strut BC$.$ The angle $"$Q$"\backslash (=35\backslash )$ degrees and the angle $"\backslash ($ F $\backslash )"=22$ degrees. Use a $"\backslash ($ g $\backslash )"$ value of $\backslash (9\mathrm{.}81\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ).$ Alberta Institute of Technology

Calculate: The magnitude of the reaction at point $"\backslash ($ A $\backslash )"$ and internal force in the strut BC$.$ Specify tension or compression for the strut.