A person weighing 67 Kg is doing a standing straight leg extension against a wall. The distance from the leg to the bottom of the foot is 1 meter. You can assume the values in Anthropomorphic Data table (4.1) are accurate.
a. If the person holds her leg at 45 degrees what is the force and moment that must be applied at the hip joint?
b. Now we observe the person while exercising. If the person raises her leg with a constant angular velocity of 45º/sec, what is the force and moment that must be applied at the hip joint when the leg is at 45º?