Taking a sip of coffee one day, you start thinking about the effort it takes to do so. Your forearm is a type of lever. As shown in Figure P9.79, the biceps muscle is attached to the forearm bone about \(50 \mathrm{~mm}\) in front of the elbow joint. The cup of coffee in your hand is \(350 \mathrm{~mm}\) from the elbow, and your forearm is essentially horizontal. The biceps does work on the forearm as you raise the cup very slowly. You realize that you can use energy principles to estimate the forces involved.

Transcribed Image Text:

Figure P9.79