Questions
A uniform disc of radius a and mass m is rotating freely with angular speed in a horizontal plane about a smooth fixed vertical axis through its centre. A particle of mass m is suddenly attached to the rim of the disc and rotates with it. The new angular speed is
detailed solution
Correct option is B
From the conservation of angular momentum, Iω1=I2ω2⇒ ω2=I1I2ω1=12ma212ma2+ma2ω=ω3Talk 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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