Momentum and CollisionHard
Question
A circular disc of radius R is removed from a bigger circular disc of radius 2R such that the circumferences of the discs coincide. The centre of mass of the new disc is αR from the centre of the bigger disc. The value of α is
Options
A.1/3
B.1/2
C.1/6
D.1/4
Solution
In this question distance of centre of mass of new disc is αR ; 
⇒
;
Moment about centre of mass of whole disc should be zero,
⇒
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