1700993340
7-29 λ=0.061.
1700993341
1700993342
7-30 Q=2.32×103.
1700993343
1700993344
7-31 ω=ω0.
1700993345
1700993346
7-32 γ=1.6×10-3N·s/m,fM=1.0×10-3N.
1700993347
1700993348
1700993349
7-33
1700993350
1700993351
7-34 0.07655~76.55m.
1700993352
1700993353
7-35 5.5×1014Hz.
1700993354
1700993355
7-36 (1)A=5.0cm,ω=4.0π/s,u=2.0m/s,λ=10cm;(2)x=(-3.0+10k)cm,k=0,±1,±2,….
1700993356
1700993357
1700993358
7-37 (1)λ=8cm; (2)
1700993359
1700993360
1700993361
1700993362
(3)(4)
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
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