JEE Main 2007 Physics 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 from the centre of the bigger disc. The value of is
Answer: (1)
Solution
Masses ∝ areas: big disc 4m (centre at origin), removed disc m with centre at distance R. Remaining mass 3m: $ = =
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