82. A uniform disc of mass M and radius R is rotating about a horizontal axis passing through its centre with angular velocity ω. A piece of mass m breaks from the disc and flies off vertically upwards. The angular speed of the disc will be
(a) (M-2m)ω/(M-m)
(b) (M+2m)ω/(M+m)
(c) (M-2m)ω/(M+m)
(d) (M+2m)ω/(M-m)
Ans. a
(137)
3.8/5 - (13 votes)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (118)
(a) 34 J (b) 70 J (c) 84 J (d) 134 J Answer-d (202)