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Relation between Linear and Angular Speed

An insect tra...

Question

An insect trapped in a circular groove of radius $12 c m$ moves along the groove steadily and completes 7 revolutions in $100 s$ . What is the linear speed of the motion

A

2.3 c m / s

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B

5.3 c m / s

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C

0.44 c m / s

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D

none of these

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Solution

The correct option is B $5.3 c m / s$
$v = \frac{7 \times 2 π \times 12}{100} = 5.3 c m / s e c$

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