Consider a circular disc of radius 20 cm with centre located at the origin. A circular hole of radius 5 cm is cut from this disc in such a way that the edge of the hole touches the edge of the disc. T

Question

Consider a circular disc of radius 20 cm with centre located at the origin. A circular hole of radius 5 cm is cut from this disc in such a way that the edge of the hole touches the edge of the disc. The distance of centre of mass of residual or remaining disc from the origin will be

Question diagram: Consider a circular disc of radius 20 cm with centre located

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Answer:

C

Solution:

$mass of disc = m$
$mass of cut part = \frac{m}{16}$
$X_{co m} = \frac{m \times 0 - \frac{m}{16} \times 15}{m - \frac{m}{16}}$
$= 1 cm .$

TestHub · Accepted Answer

mass of disc = m mass of cut part = 16 m ​ X co m ​ = m − 16 m ​ m × 0 − 16 m ​ × 15 ​ = 1 cm .

Physics - Centre of Mass & Collision Question with Solution | TestHub

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