When you are lying horizontally, these muscles make an angle of approximately 5.00 with the femur, and if you raise your legs, the muscles remain approximately horizontal, so the angle increases. We shall assume for simplicity that these muscles attach to the femur in only one place, 10.0cm from the hip joint (although, in reality, the situation is more complicated). For a certain 80.0kg person having a leg 90.0cm long, the mass of the leg is 15.0kg and its center of mass is 44.0cm from his hip joint as measured along the leg. If the person raises his leg to 60.0 above the horizontal, the angle between the abdominal muscles and his femur would also be about 60.0.
Part A With his leg raised to 60.0, find the tension in the abdominal muscle on each leg.
Part B When is the tension in this muscle greater, when the leg is raised to 60.0 or when the person just starts to raise it off the ground?
when the person just starts to raise
or
when the leg is raised to 60.0
If the abdominal muscles attached to the femur were perfectly horizontal when a person was lying down, could the person raise his leg?
Yes or No