2. Moments

A first-year orthopaedic resident, Barkley Brown found himself on radiology service shortly after arriving at Metro General Hospital to start his residency and discovered that he had a little unexpected spare time. Having lifted weights during high school and college to keep in shape for wrestling and football, Dr. Brown welcomed the chance to go to the gym and pump a little iron. He preceded his lifting by doing a series of upper- and lower-body stretches and then started to work on individual muscle groups—first the biceps, then the triceps, then the “pecs,” then the “lats,” and so on. How much force did he generate across the elbow joint by doing a biceps curl with a 15-kg weight?