BITSAT Physics System Of Particles And Rotational Motion Online Test Set B

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Question 1

Question

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 the plane with angular velocity _. Another disc of same mass but half the radius is gently placed over it coaxially. The angular speed of the composite disc will be :

Answer

(5/4) ω

 

(5/2) ω

(2/5) ω

(4/5) ω