COMEDK · Physics · 8. Rotational Motion
A rigid body is said to be in rotational equilibrium:
- A If the net external torque acting on the body is zero
- B If the net external force acting on the body is zero
- C If the net internal force acting on the body is zero
- D If the net angular momentum of the body is zero
Answer & Solution
Correct Answer
(A) If the net external torque acting on the body is zero
Step-by-step Solution
Detailed explanation
A rigid body is in rotational equilibrium when it does not undergo any angular acceleration. According to Newton's second law for rotation, the net external torque \(\vec{\tau}_{ext}\) acting on a body is equal to the rate of change of its angular momentum, given by…
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