Question

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what is the centre of mass of cylinder and ring

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Answer 1

IN CYLINDERS,
1/4OF HEIGHT IF HOLLOW THEN AT 1/3 OF HEIGTH.

IN RINGS.

CENTRE OF THE INNER EMPTY SPACE OF THE RING.

Answer 2

Centre of mass of a cylinder lies at its geometrical centre i.e. at the mid-point of its axis of symmetry. ... No, it does not necessary that centre of mass of a body lie inside it, because in some cases such as a ring, a hollow cylinder, a hollow sphere and a hollow cube centre of mass lies outside.

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