Question

find the centre of mass of the remaining disc if a circular hole of radius 1 m is cut off from a disc of radius 6M and the centre of the hole is 3 metres from the centre of the disc​

Answer 1

R/6; from the original centre of the body and opposite to the centre of the cut portion.

Mass per unit area of the original disc = σ

Radius of the original disc = R

Mass of the original disc, M = πR2σ

The disc with the cut portion

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