Engineering Mechanics Statics - J. L. Meriam -7th Edition- Solution Manual -

In his own scribbled notes, Elias had assumed the force at pin C was acting to the right. But the solution manual’s elegant arrow pointed to the left. It was a subtle distinction, a simple reversal of assumption, but it cascaded through the entire problem, toppling his equations like dominoes.

F1 = 100 N, θ1 = 30° F2 = 150 N, θ2 = 60° In his own scribbled notes, Elias had assumed

F1x = F1 cos θ1 = 100 cos 30° = 86.6 N F1y = F1 sin θ1 = 100 sin 30° = 50 N In his own scribbled notes