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Simple Harmonic Motion: During one complete cycle, for what length of time is the postion of the object greater than A/2?

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An object moves with simple harmonic motion of period T and amplitude A. During one complete cycle, for what length of time is the postion of the object greater than A/2?

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x(t) = A cos(wt+b)

where x is the position, A is the amplitude, w is the angular velocity, and b is the ...

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