First, gently swing your arm in a vertical circle, pivoting at the shoulder (point your arm straight down, then bring it up over your head without bending the elbow, and then back down again Like a fast-pitch softball pitch) and keeping the rest of the arm straight and unbent. Observe the motion of your arm, paying particular attention to the motion of the elbow and the motion of the hand Using a stopwatch (and an assistant?), time how long it takes for you to rotate your arm five consecutive times without stopping. Again, this should be a gentle motion. You should not risk pulling or straining a muscle in your shoulder! 7. Complete your answers in the box below regarding these questions about the acceleration and angular acceleration of the elbow A. What was the average angular acceleration (degrees/s? and rad/s ) of the elbow? B. What was the average centripetal acceleration (m/s?) of the elbow? C. How do these compare to the hand? Why are they the same and/or different