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Phasors

The equation ...

Question

The equation of a simple harmonic motion is X = 0.34 cos ( 3000 t + 0.74 ) where X and t are in mm and sec. The frequency of motion is

3000

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3000/2π

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0.74/2π

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3000/π

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Solution

The correct option is B
3000/2π

From given equation $ω = 3000, \Rightarrow n = \frac{ω}{2 π} = \frac{3000}{2 π}$

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