A front-loading washing machine is mounted on a thick rubber pad that acts like a spring; the weight W = mg (with g = 9.8 m/s2) of the machine depresses the pad exactly 0.5 cm. When its rotor spins at ax radians per second, the rotor exerts a vertical force F0 cos ωt newtons on the machine. At what speed (in revolutions per minute) will resonance vibrations occur? Neglect friction.
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