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A uniform disc of diameter R/2 is put over another uniform disc of diameter R of same thickness and density. The peripheries of the two discs touch each other. The centre of mass of the system from centre of big disc is

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By Expert Faculty of Sri Chaitanya
a
R/10
b
R/20
c
9R/10
d
11R/10

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detailed solution

Correct option is B

For disc distance of CM from big disc


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Find the position of centre of mass of a uniform disc of radius R from which a hole of radius r is cut out. The centre of the hole is at a distance R2 from the centre of the disc.

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