V bob. Tebranish va to’lqinlar. 25-&. Tebranma harakat energiyasi

Javob: C) )
26.4. Agar tebranish davri T bo’lgan prujinali mayatnikka osilgan yukning massasi n marta oshirilsa,tebranishlar davri qanday bo’ladi?
A) B) C)T/ D)
Berilgan
Yechilishi: Prujinali mayatnik uchun tebranish davrini topish formulasidan foydalanamiz:

_____________ Bu ifodalarning nisbatini olamiz:
= ?
Demak.
Javob: D)
26.5. Birkligi ga teng bo’lgan prujinaga osilgan yuk chostata bilan tebransa, birkligi = bo’lgan prujinaga osilgan o’sha yukning o’zi qanday chostata bilan tebranadi?
A) B) C) D)
Berilgan: Yechilishi:Siklik chostatani toppish formulasidan
foydalanamiz:
.
Demak:
_________________ Ifodaga ega bo’lamiz.Bu ifodalarni nisbatini olamiz:


Javob: D)
26.6. bikrligi 100N/m,yukining massasi 10g bo’lgan prujinali mayatnikning tebranish chostatasi qanday?
A)6 B)8 C)10 D)16
Berilgan:
k=100N/m
m=10g= kg Yechilishi:Prujinali mayatnik uchun tebranish chastotasini
_______________ topish formulasidan foydalanamiz:
v=?
Javob: D)16
26.7. Prujinaga osilgan 200 g massali yuk bir minutda 30 marta tebrandi.Prujinaning bikrligi qanday?
A)0.2 B)0.05 C)2 D)0.63
Berilgan Yechilishi: Prujinali mayatnik uchun tebranish davrini
k = 100 N/m toppish formulasidan foydalanamiz:
m = 10 g = .
__________________ Ikkala tenglamani tebglashtiramiz: k=?
.
Ildizdan chiqarish uchun tenglamaning ikki tomonini kvadratga oshiramiz:

Bu ifodadan quyidagini olamiz: