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Calculate the angular frequency of the waveform y(t)=69sin(40πt+4π).

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Calculate the angular frequency of the waveform y(t)=69sin(40πt+4π).

(a) 40π Hz

(b) 60π Hz

(c) 70π Hz

(d) 20π Hz

I got this question in final exam.

I would like to ask this question from Methods to Reduce the Energy Loss During Starting in chapter Starting of Electric Drives

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The correct option is (a) 40π Hz

Easy explanation: The fundamental time period of the sine wave is 2π. The sinusoidal waveform is generally expressed in the form of V=Vmsin(Ωt+α) where Vm represents peak value, Ω represents angular frequency, α represents a phase difference. Ω can be directly calculated by comparing the equations. Ω = 40π Hz.

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