2023届高三物理复习重难点突破47机械波（解析版）

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15312ᑣ@&ᓃ=3=3s"#&t=7+/77(/7=0,1,2,3…)D7=7~=S(஻=0,1,2,3…),44஻ᓝ3஻=0@Dᕜ7=4s,AVDB┯¢+RTxU]ᔣDᙠ=5s@஺ᜐQ£D119ᑣAt=+T+஻T(஻=0,1,2,3…)D7=¦=7s(஻=0,1,2,3…)D஻=0@Dᕜ7=12s,44஻+1CVDD┯¢஺26.(⌱)(2022•©ª«¬®)ᑡ;<=TxUDt=0@AOB᝞5678ᡠLDm@x=0ᜐḄTyU]ᔣ+t=2.0s@AB᝞56J8ᡠL஺ᑣ()A.ḄWXn90.3m/sB.ḄWXn90.9m/sC.mᑡḄ°90.8mD.mᑡTxU]ᔣூ`ᫀ௃ABூ᪆௃²9x=0ᜐḄTyU]ᔣDᡠzmᑡTxUVᔣDD┯¢+᪷´⚪µ42X(0.8-0.2)(A+/)—2s(n—0,1,2,…)DᡠzW9v——=---------------------m/s=(0.6஻+0.3)m/s(஻=0,1,2,•••),஻=0@iD=0.3m/s,஻=1@r=0.9m/s,AஹBV+mᑡḄ°94=2X(0.8—0.2)m=1.2m,C┯¢஺27.ᑡ;<=TxUDaஹ69xU¼½0.5mḄ¾D᝞5ᵬᡠL.¾Ḅ5ᑖÁ᝞53ஹÂᡠL.(1)OᙠOÃ6ḄWX92.5m/s@DoOḄ°+(2)ROḄ°ᜧQ0.3m,onḄW.5ூ`ᫀ௃প2m(2)Rᵫaᔣ6ᔣDW9*s,Rᵫ6ᔣaᔣDW92.5m/sᡈ0.5m/s

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