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Question

A circular disc is rotating with constant ω=2 rad/sec, about an axis passing through its centre. Two objects are kept at a distance of r1=2 cm and r2=1 cm from the centre. The ratio of their linear speeds is.

A
2:1
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B
4:1
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C
1:1
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D
2:4
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Solution

The correct option is A 2:1

v=rω

v1=r1ω=2×2=4 cmsec

v2=r2ω=1×2=2 cmsec

v1v2=42=21


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