You're referring to a popular textbook in the field of engineering mechanics!
First, maybe the solutions are detailed. I remember that in some manuals, you just get the final answer, but not the steps to get there. This manual probably has step-by-step explanations. That would be helpful for understanding how to approach the problems. Also, maybe there are different methods to solve certain problems, and the manual covers multiple approaches. That could be another feature.
: Reflecting the textbook’s philosophy, the solutions prioritize the construction of FBDs as a vital first step in problem formulation.
– Many solutions end with a verification step (e.g., checking sum of moments around an alternative point to confirm equilibrium).
Mathematical accuracy is the hallmark of this series.