1.

An insect trapped in circular groove of radius 12 cm moves along the groove steadily and completes 7 revolutions in 100s. The linear speed of the insect isA. 4.3 cm `s^(-1)`B. 5.3 cm `s^(-1)`C. 6.3 cm `s^(-1)`D. 7.3 cm `s^(-1)`

Answer» Correct Answer - B
Here, r=12 cm, frequency, `v=(7)/(100)rps`
The angular speed of the insect is
`omega=2piv=2pixx(7)/(100)=0.44rads^(-1)`
The linear speed of the insect is `v=omegar=0.44xx12=5.3cms^(-1)`


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