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24. A small steel sphere is tied to a string and iswhirled in a horizontal circle with a uniformangular velocity ω1. The string is suddenlypulled so that the radius of the circle is halved. Ifω2 is the new angular velocity, then(a) ω1>ω2(c) ω1-02(b)(d)ω1=202ω2 > 0).

Answer»

Option ATake an element of length dr.

mass per unit length= m/l dr

Tension=integral mw2rdr/L=mw2r2/2L



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