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Q. An earthquake-produced surface wave can be approximated by a sinusoidal transverse wave. Assuming a frequency of 0.52 Hz (typical of earthquakes, which actually include a mixture of frequencies), what amplitude is needed so that objects begin to leave contact with the ground?

Q. A 1250 kg car is moving at 5.0 m/s collides with and couples with a 750 kg car.What is the resulting speed of the coupled cars?

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