19. B 200 N
20. C. ( 0,0,-18.47) rad/s2.
Problem: (2 Parts) Below we show a simplified model of a person's leg in cast that...
Problem: (2 Parts) Consider a stick of mass, M = 12.0 kg and length, L = 1.70 m hanging vertically initially. A bullet of mass, m = 0.030 kg and speed, v = 50 m/s strikes and embeds itself at the bottom end of the stick. Magnitude of acceleration due to gravity is g = 10 m/s2. Note: The moment of inertia of a rod about it's center of mass I = 1 ML?. You may need to use the...
PROBLEM 2 Knee Extension - The angular motion of the lower leg about the knee joint, and the forces and torques produced by the muscles crossing the knee joint during knee flexions and extensions have been investigated by a number of researchers utilizing different experimental techniques. One of these techniques is discussed here. Consider the person illustrated in Fig. 10.12. The test subject is sitting on a table, with the back placed against a back rest and the lower legs...