Question

a circular platform is revolving with uniform angular speed (a) how will its speed change if a mass (M) is placed at the edge of the platform? (b) how will the speed be affected if the mass is shifted towards the centre of the platform?​

Answer 1

Explanation:

When no external force acts on a body its angular moment remains conserved.

From law of conservation of angular momentum, we have

J=lω=constant

where l is moment of inertia of the body and ω is angular velocity.

Also l=

2

1

MR

2

(for disc) where M is mass and R is radius of disc.

J=

2

1

MR

2

ω= constant

Since, man moves towards the centre of the disc, distance of mass distribution R decreases hence, ω increases.

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