Questions
A hollow straight tube of length l and mass m can turn freely about its centre (fixed) on a smooth horizontal table. Another smooth uniform rod of same length and mass is fitted into the tube so that their centres coincide. The system is set in motion with an initial angular velocity . The angular velocity of the rod at an instant when the rod slips out of the tube is:
detailed solution
Correct option is D
Initial angular momentum about O isL1 = 2(ml212)ω0 = ml26ω0Final angular momentum about O isLf = Iω = [ml212+(ml212+ml2)]ω = 76ml2ωAngular momentum will be conservedLi = Lf or ω = ω07Talk 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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