for the purposes of answering this question assume that the arm itself is weighl

Question

for the purposes of answering this question assume that the arm itself is weighless. if the muscle attached to the arm can contract at a rate of 7.0 cm/s withforce of 15000 N then

a. what is the maximum angular velocityof the arm if the muscle is attached 1 cm from the elbow?

b. What is the maximum weight that can held in the hand if the muscle is attached 1 cm from the elbow?

c What is the maximum angular velocity of the arm if the muscle is attached 3 cm from the elbow?

d. What is the maximum weight that can held in the hand if the muscle is attached 3 cm from the elbow?

Explanation / Answer

(a) Angular velocity(W) = V/r = 7/1= 7 sec-1

(b) for max. weight

moment of force = moment of weight lifted ( about elbow)

(1)*15000 = x*9.8*40

x= 38.26 Kg

(c) Angular Velocity(W) = V/r = 7/3 sec-1

(d)for max. weight

moment of force = moment of weight lifted ( about elbow)

(3)*15000 = x*9.8*40

x= 114.79 Kg

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