Question

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answer this

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Answer 1

Answer :- (A) 4R/3π

Explanation :- centre of mass of uniform quarter disc .

Mass per unit area of disc = M/πR²/4 = 4M/πr²

Area of the assumed element = 1/2πrdr

dm = (1/2 πrdr )4M/πR² = 2Mr/R²dr

Xcm = 1/M [xdm ] limit 0 to R , putting , we get

4R/3π

similarly , ycm = 4R/3π

Hence option (A) is correct option .

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@Rajkumar111