Answer Happy

9 e 15° Prob. 3 (10 points) The FBD Protocol applies to this problem. A uniform half-disk rests on an inclined plane, as shown. There is sufficient friction at the point of con- tact to prevent slipping between the half-disk and the plane. Please calculate the angle e when the half-disk is in equilibrium.
Important Notes: 1. The figure for each problem is shown above the text for the problem. 2. The FBD protocol remains in effect, and every problem to which they apply will note "the FBD Protocol applies" in the problem text. To recap, the FBD pro- tocol directs you to include, in your submitted work, three distinct parts, labeled (a), (b), and (c). The (a) part must consist of just a sketch of the body or bodies that you have chosen to isolate. No force or moment arrows or symbols should appear in your (a) sketch. The (b) part must reproduce your isolated-body sketch(es) from (a), and in addition the forces and/or moments that “the rest of the universe" exerts on each isolated body must be shown, and labeled with appropriate symbols. These sketches constitute complete free-body diagrams (FBDs) of the isolated body(ies). The (e) part must consist of the equations that enforce force and/or moment equilibrium of the isolated body(ies), as appropri- ate. These equations should make use of the symbols that appear in your (b) part. Parts (a) and (b) as described here must be present in order to get any credit for your work. If you skip straight to equations without doing (a) and (b), you will get zero credit for the problem, even if your equations and answer are correct.