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Q.

A uniform circular disc of radius 20cm. A circular disc of radius 10cm is cut concentrically from the original disc. The shift in centre of mass is___

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a

$\frac{1}{400} cm$

b

$\frac{7}{300} cm$

c

$\frac{1}{200} cm$

d

Zero

answer is D.

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Detailed Solution

The center of mass of the remaining disc will also coincide with the center of mass of the original disc.

So the shift in center of masses will be zero.

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A uniform circular disc of radius 20cm. A circular disc of radius 10cm is cut concentrically from the original disc. The shift in centre of mass is___