- 71 - - 71 - 15. Prujinaga osilgan yukning massasi 60 g ga ortganda, uning
tebranish davri 2 marta ortgan bo‘lsa, yukning dastlabki massasi
qancha bo‘ladi (g)?
A)60 B)40 C)20 D)30
17. Prujina uzunligini 2 marta qisqartirib, unga osilgan yuk
massasini 2 marta orttirsak uning tebranish davri qanday o‘zgaradi?
A)4 marta ortadi B)4 marta kamayadi
C)2 marta ortadi D)o‘zgarmaydi
18. Bikrligi k
1
ga teng bo‘lgan prujinaga osilgan yuk ω
1
chastota
bilan tebransa, bikrligi k
2
=4k
1
bo‘lgan prujinaga osilgan o‘sha
yukning o‘zi qanday ω
2
chastota bilan tebranadi?
A)ω
2
=2ω
1
B)ω
2
=4ω
1
C)2ω
2
=ω
1
D)ω
2
=ω
1
19. Massasi 4 kg bo‘lgan yuk prujinaga osilgan va T davr bilan
garmonik tebranmoqda. Davr T/2 gacha qisqarishi uchun yukning
necha kilogammini olib tashlash kerak?
A)2 B)3 C)3,5 D)1
20. Prujina o‘ziga osilgan yuk ta’sirida vertikal vaziyatda 10 cm ga
uzaydi. Shu mayatnikning davrini toping (s).
A)2 B)0,157 C)0,314 D)0,628
21. Elastik prujinaga osilgan yuk garmonik tebranadi. Shu yuk
huddi shunday lekin 16 marta uzun prujinaga osilsa, tebranish davri
qanday o‘zgaradi?
A)2 marta kamayadi B)2 marta ortadi
C)o‘zgarmaydi D)4 marta ortadi
22. Parallel (yonma – yon) ulangan, bikrligi k ga teng bo‘lgan ikkita
bir xil prujinaga maxkamlangan m massali yukning tebranish
chastotasi nimaga teng bo‘ladi?
A)
m
k
2
1
p
B)
m
2
k
2
1
p
C) m
k
2
2
1
p
D)
m
2
k
4
1
p
23. Ketma – ket ulangan, bikrligi k bo‘lgan ikkita bir xil prujinaga
osilgan m massali yukning tebranish davri nimaga teng bo‘ladi?
A)
k
2
m
2
p
B) k
m
2
2
p
C)
k
m
p
D)
k
2
m
4
p
24. Prujinali mayatnik prujinasining yarmi kesib tashlansa, uning
tebranishlari chastotasi qanday o‘zgarishini toping.
A)2 marta ortadi B) 2 marta kamayadi
C) 2 marta ortadi D)2 marta kamayadi
25. Prujina 2 marta qisqartirilib, yukning massasi 2 marta orttirilsa,
prujinali mayatnikning tebranish davri qanday o‘zgaradi?
A)4 marta ortadi B)o‘zgarmaydi
C)2 marta ortadi D)2 marta kamayadi
26. Bikrligi 250 N/m bo‘lgan prujinaga osilgan yuk 16 s da 20
marta tebranadi. Yukning massasini toping (kg).
A)5 B)6 C)4 D)0,5
27. Prujinali mayatnik yukining massasini va tebranish
amplitudasini 4 marta orttirsak, uning tebranish davri necha marta
ortadi?
A)16 B)8 C)4 D)2