SOLVE The mathematical steps are based on the fact that an object in static equi
ID: 3892766 • Letter: S
Question
SOLVE The mathematical steps are based on the fact that an object in static equilibrium has no net force and no net torque:
ASSESS Check that your answer is reasonable and answers the question.
When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.00 kg. If the biceps is connected to the forearm a distance d_biceps = 3.50 cm from the elbow, how much force F_biceps must the biceps exert to hold a 600 g ball at the end of the forearm at distance d_ball = 37.0 cm from the elbow, with the forearm parallel to the floor? How much force F_elbow must the elbow exert?
Explanation / Answer
there will be no force equation along x
along y its
Fy =( Mball+Mforearm)*g = Fbiseps
torque equation
Fbiseps *d_biseps = Fforearm * d_ball/2 + Fball*d_ball
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