[填空题]
An earthquake-produced surf2z s(o,e3p1rpou1bs o ace wave can2h- ud qrzjysob)):n- 3hmxn4 be approximated by a sinusoidal transverse wave. Assuming a frequency of 0.50 Hz (typical of e 3qrhusjm y n4) no-)hzx-2:dbarthquakes, which actually include a mixture of frequencies), what amplitude is needed so that objects begin to leave contact with the ground? [Hint: Set the acceleration a>g] m
