84. A thin uniform circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with an angular velocity ω . Another disc of same dimension but of mass M/4 is placed gently on the first disc coaxially. The angular velocity of the system now is
(a) 2ω/5
(b) 2ω/√5
(c) 4ω/5
(d) 4ω/√5
Ans. c
(17)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)