Questions
An equilateral triangle ABC formed from a uniform wire has two small identical beads initially located at A. The triangle is set rotating about the vertical axis AO. Then the beads are released from rest simultaneously and allowed to slide down, one along AB and other along AC as shown. Neglecting frictional effects, the quantities that are conserved as the beads slide down, are
detailed solution
Correct option is B
Since no dissipative forces are acting in the system, mechanical energy of the system is conserved. Also weights of the beads and triangular frame work and the reaction at A are the external forces acting on the system, but they do not produce any net moment about the axis of rotaion. Hence angular momentum of the system is conserved.Talk to our academic expert!
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A disc rotates freely with rotational kinetic energy E about a normal axis through centre. A ring having the same radius but double the mass of disc is now, gently placed on the disc. The new rotational kinetic energy of the system would be
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