Two point masses of 0.3 kg and 0.7 kg are fixed at the ends of a rod of length 1.4 m and of negligible mass. The rod is set rotating about an axis perpendicular to its length with a uniform angular speed. The point on the rod through which the axis should pass in order that the work required for rotation of the rod is minimum is located at a distance of
Text Solution
Verified by ExpertsThe correct answer is:
B
Work-energy theorem, 
Given: w is constant
So required work done to be minimum implies that I must be minimum.
Let the rotational axis passes through 
.
For I to be minimum, 
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