(10 points) Consider two muscles with the following properties, and assume that the moment arm is constant:
Muscle 1 Muscle 2
Fmax (N) 140 180
Lo (cm) 9 6
Moment Arm (cm) 2 1.8
a) If both muscles are operating at their optimal fiber length, Lo, how much moment can each muscle produce?
b) Assume both muscles are at their optimal fiber length, but then the joint angle changes by 40° causing both muscles to shorten. What is the new length for each muscle?
c) Assuming a linear force-length relation, what muscle force is produced in each muscle at this new length? Which is larger? Show your work.