Rotation 5 Question 8
18. Two point masses of and are fixed at the ends of a rod of length 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
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 18. (c)
Solution:
- Work done,
If
For work to be minimum, the moment of inertia