MHT CET Physics question
A body of mass hangs at one end of a string of length , the other end of which is fixed. It is given a horizontal velocity so that the string would just reach where it makes an angle of with the vertical. The tension in the string at mean position is
Answer: (A)
Solution
Energy: v² = 2gl(1 - cos 30°) = gl(2 - √3); at the mean position T = mg + mv²/l = mg(3 - √3) = 1.27 mg. (b)
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