Force Oscillation and resonance 1 answer below »

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A front-loading washing machine is mounted on a thick rubber pad that acts like a spring; the weight W=mg ( with g=9.8m/s^2) of the machine depresses the pad exactly 0.5cm. When its rotor spins at w radians per second, the rotor exerts a vertical force Fo coswt newtons on the machine. At what speed (in revolutions per minute) will resonance vibrations occur? Neglect friction.

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