Question

A shank has a moment of inertia about the knee joint of 0.18 kg∙m^2. Assume that the quadriceps muscles (vasti and the rectus femoris) contract to extend the knee. If the vasti produce a torque of 0.4 Nm about the knee joint, what torque (in Nm) about the knee joint must the rectus femoris produce to cause a shank angular acceleration of 23.2 rad/s^2?

Answer 1

Answer:

Torque will be equal to 4.176 N-m

Explanation:

It is given moment of inertia about knee joint $I=0.18kgm^2$

Angular acceleration produced $\alpha =23.2rad/sec^2$

We e have to find the torque

Torque is equal to $\tau =I\alpha$ , here I is moment of inertia and $\alpha$ is angular acceleration.

Torque will be equal to $\tau =0.18\times 23.2=4.176Nm$

So torque is equal to 4.176 N-m