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Waves, Heat and Light and Oscillation

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A damped harmonic oscillator consists of a mass M - 0.4 kg, attached to a spring with spring constant k - 0.20 N/m, all immersed in a viscous fluid that exerts a damping force F = -bv. The amplitude of the oscillation is observed to decrease by a factor of 2 after 10 oscillatory cycles. What is the value of b?

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