A rod of length L & mass M is rotating in a circle about one end then calculate tension in the rod at a distance 'x' from the support ?
For its solution why should we take mass of L-x portion of rod instead of taking mass upto x distance from support as we have the formula
T = m w2 x I m in confusion....
Answer
You have to take the mass from L to x, since that is the mass which has to be accelerated by the centripetal force due to the tension at position x. The remaining mass of the rod (before position x) doesn't add anything to the tension in x.
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