Berilgan: K=125 N/m t=8s N=5 m=? Yechilishi
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Javob: B)20.
26.16. Prujinaga osilgan yuk garmonik tebranadi.Shu yuk xuddi shunday,lekin 4 marta uzun prujinaga osilsa, tebranish davri qandey oβzgaradi? A)2 marta ortadi B)4 marta kamayadi C)4 marta ortadi D)2 marta kamayadi Berilgan : π2 = 4π1 Yechilishi:Prujinalarga ikkala hilda ham bitta jisim osilgani π1 = π uchun elastiklik kuchi bir boβladi. π2 = π Ξ€1 =? πΉπ = πΉπ Ξ€2 1 2 bikirlik uzunlikka teskari proporsional. π π = πΈ ; ππ = πΈπ; π π1π1 = π2π2 = π24π1; π1 = 4π2. Yuqoridagi formuladan asosan: 2 π π1 ; π2 = 2π1 Javob: A)2 marta ortadi. 26.17.Agar prujinali mayatnik prujiansining yarmi kesib tashlansa ,uning tebranishlari chastotasi qandey oβzgaradi? A) marta ortadi B)2 marta ortadi C)2 marta kamayadi D) marta kamayadi Berilgan: π1 = 2π2 Yechilishi:Shart yuqoridagi masala bilan bir xil . ga ega boβlamiz. π1 = π Chastotaning davrga bogβlanish ifodasidan foydalanamiz: π2 = π π1 =? π = π2 1 π1 π π 1 ; π π π Javob:A ) marta ortadi. 26.18. Agar prujina 2 marta qisqartilib, yukning massasi 2 martta orttirilsa, prujinali mayatnikning tebranish davri qandey oβzgaradi? A)oβzgarmaydi B)2 marta kamayadi C) 2 marta ortadi D) 4 marta kamayadi Berikgan: π1 = 2π2 Yechilishi: uzunlikdagi prujinaga massali yuk osilgan, π1 = π uzunlikdagi prujinaga massali yuk osilgan. π2 = π Ξ€1 =? Ξ€2 Bikirligi uzunlikka teskari proporsional. π π = πΈ ; ππ = πΈπ; π π2π2 = π1π1 = π12π2; π2 = 2π1 Yuqoridagi formulaga asosan: 2πβ π1 βπ1π2 βπ2π1 ; 21 π1 = π2. Download 258.08 Kb. Do'stlaringiz bilan baham: |
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