打字猴:1.700993363e+09
1700993363
1700993364
1700993365 7-38 
1700993366
1700993367 7-39 ξB=5cos(4πt-1.71π)cm.
1700993368
1700993369 7-40 略.
1700993370
1700993371 7-41 ν=3100Hz.
1700993372
1700993373
1700993374 7-42 波形曲线略.
1700993375
1700993376 7-43 ν1=965Hz,ν2=1025Hz.
1700993377
1700993378 7-44 ν拍=15Hz.
1700993379
1700993380 7-45 v=6.03m/s.
1700993381
1700993382 7-46 m1=15.3kg,m2=3.8kg,m3=1.7kg.
1700993383
1700993384
1700993385 7-47 
1700993386
1700993387 7-48 A大=1.3m,A小=0.3m,∆t=150h(小时).
1700993388
1700993389
1700993390 7-49 t0≥t≥0时段:
1700993391
1700993392
1700993393 t>t0时段:
1700993394
1700993395 7-50 左侧4μmg/k处.
1700993396
1700993397 7-51 18cm.
1700993398
1700993399
1700993400 7-52 
1700993401
1700993402
1700993403 7-53 
1700993404
1700993405
1700993406 7-54 
1700993407
1700993408 7-55 略.
1700993409
1700993410 7-56 (1)略;  (2)T=2πlsinθ0/vA0.
1700993411
1700993412
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