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CBSE Class 11-science Answered

For a rigid body to be in rotational equilibrium, prove that the sum of all the external torques acting on it is zero.
Asked by Topperlearning User | 12 Aug, 2014, 07:40: AM
answered-by-expert Expert Answer

As we know that rotational motion of a rigid body is governed by the following equation: 

 is the sum of all the external torques acting on the body, and  represents the rate of change of angular momentum. 

For equilibrium,  must have fixed value.

Answered by | 12 Aug, 2014, 09:40: AM

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