Question

2. (10 points) If time interval between two positions is 0.7s econds then average a) rotational speed of the muscle (in sa) was S5. าา b) rotational speed of the lower arm (in s') was 1o1.1 c) linear speed of the load (in m/s) was 3. (10 points) If biceps cross-sectional area A is 16 cm2 muscle stress (in a) in situation A is b) in situation B is dyn/cm) Is any of these stresses dangerous? (Muscle rupture strength 0.55x10' dyn/cm) 4. (10 points) Use energy conservation to define the work (in Joules) done by the biceps during from position A to position B 5. (10 points) If muscle is associated with a spring what would be its stiffness K (in dyn/cm)? 6.(10 points) If biceps length / is 21 cm what is its Young's Modulus Y (in dyn/cm')? 2 7.(10 points) If weight was allowed to fall freely what would be its speed (in m/s) nea

Answer 1

Here, delta theta = 100 degree - 60 degree = 40 degree = 40 times pi/180 rad And delta t = 0.7 s therefore Rotational speed of muscle = delta theta/delta t = 40 times pi/180 times 0.7 = 0.488 rad/s. Linear speed of load = wr = 0.488 times 36 times 10^-2 m/s = 0.175 m/s