A circular disc is rotating with constant ω=2 rad/sec, about an axis passing th

Question

A circular disc is rotating with constant

ω = 2

rad/sec, about an axis passing through its centre. An object is kept at a distance of

^{'} r_{1} = 2 c m^{'}

from the centre and another object is kept at a distance of

^{'} r_{2} = 1 c m^{'}

. Find the ratio of their linear speeds.
___

Answer:
:

v = r ω

v_{1} = r_{1} ω = 2 \times 2 = \frac{4 c m}{s e c}

v_{2} = r_{2} ω = 1 \times 2 = \frac{2 c m}{s e c}

\frac{v_{1}}{v_{2}} = \frac{4}{2} = 2

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