Dinamika test
1. Jismning inertligi nima bilan xarakterlanadi.
A) hajm B) ogirlik C)
zichlik
D) massa E) yuza
2. Simobniiig zichligi 13600kg/m3. 21 simob
necha kg?
A) 6,8 B) 2,72 C) 27,2 D)29,6 E)68
3 . Nyutonning 2-qonuniga berilgan to‘g ii
ta’rifni koisating.
A) jismning tezlanishi unga ta'sir etuvchi har bir
kuchga mutanosibdir.
5) jismga ta’sir etuvchi kuch jism massasiga
to‘g‘ri muttanosib va muttanosiblik koeffitsienti
tezlanishdir.
C) jismga ta’sir etuvchi
har qanday kuch shu jism
massasi bilan toia tezlanishning ko6paytmasiga
teng.
D) jismning kuch ta’sirida olgan tezlanish unga
ta’sir etuvchi kuch yo‘nalishida boiib, moduli
kuchning moduliga to'gii va jism massasiga
teskari proporsionaldir.
E) jismning kuch ta’sirida
olgan tezlanishi jism
massasiga to‘g‘ri proporsionaldir.
4. Nyutonning birinchi qonunini tavsiflovchi
ifodani koisating.
A) 9 - const, F = 0 B) F - const, 3 = at
C) F ~const, 3 = 3Q+at D) s = const, F = 0
5. Miltiqdan massasi 8 g bo’lgan o‘q 800m/s
tezlik bilan uchib chiqdi. 0 ‘q miltiq stvoli ichida
0,001 sekund
harakatlangan deb hisoblab, porox
gazlarining bosim beruvchi o‘rtacha kuchini
aniqlang (N).
A) 800 B) 3200 C) 64 D) 6400 E) 400
6. Massasi 180 kg boigan arava harakatining
birinchi sekundida 15 sm yoi bosdi. Tezlanish
beruvchi kuchni toping (N).
A) 12 B) 48 C) 27 D) 54 E) 25
7. nuqtaga qo‘yilgan kuchlaming teng ta'sir
etuvchisi qanday (N)?
8. Jismga 10 N va 20 N kuchiar o'zaro 120°
burchak ostida ta’sir etmoqda. Bu kuchlaming teng ta’sir etuvchisini toping (N).
A)22,4 B) 10 C) 26,5 D) 30 E) 17,3
9. Ikkita bir xil vaznsiz dinamometrga 10 kg
massali
yuk osilsa, yuqoridagi va pastgi
dinamometrlar necha nyutonni ko‘rsatadi?
A) 50; 50 B) 10; 10 C) 200; 200 D) 100; 100
10. Massasi 2 kg boigan jism radiusi 5 m boigan
aylana bo‘ylab 4 rad/s burchak tezlik bilan tekis
harakat qilmoqda.
Markazdan qochma kuchni
toping (N).
A) 160 B) 80 C) 16 D) 400
11.Quyida keltirilgan formulalaming qaysilari
markazga intilma kuchni ifodalaydi:
1) F = mu2/R; 2) F = mco2R; 3) F = mcovl
A) 1;2;3 B) 2 C) 3 D) l;2 E) 1
12. Yeming massasi 6• kg, Oyning massasi
7,35 • kg, ulaming markazlari orasidagi masofa 384400 km. Yer bilan Oy orasidagi tortishish kuchi topilsin (N).
A) 8 • B) 2• C)3•
D) 2• E)4•
13. Jism osilgan dinamometr Yer sirtidan 1 N ni
ko’rsatadi. Agar jism yer sirtidan ikki Yer
radiusiga
teng masofaga chiqarilsa, Yerga necha
nyuton kuch bilan tortiladi?
A) 3 B) 1/3 C) 1/9 D) 1/4 E) 1/6
14. Yer sirtidan qanday masofada kosmik к emailing Yerga tortilish kuchi Yer sirtidagiga nisbatan 25 marta kichik boiadi? Masofani Yer radiuslarida ifodalang,
A) R B) 4 R C )9R D) 3 R E)8R
15. Arqon ko'pi bilan m massali yukni koiara
oladi. Shu arqon yordamida qanday massali yukni g/2 tezlanish bilan koiarish mumkin?
A) m /2 В) Зm/14 C) m/3 D) 2m /3
16. Lift pastga tushayapti. Uning 3 m/s2
ga teng
tezlanishi yuqoriga yoiiaigarL Liftda 70 kg massali odam bor. Uning vazni (ogirligi) necha nyuton?
A) 210 B)490 C) 700 D)910 E) TJY
17. Massasi 70 kg boigan kosmonavt kosmik
kemada uchish vaqtida yuklanish 4 ga teng boidi.
Kosmonavtning ogirligini toping (kN).
A) 700 5) 1400 C) 4,2 D) 2,8 E) 5,6
18. Samoiyot 225 m radiusli Nesterov sirtmogi
(uo‘lik sirtmoq”) ni hosil qiladi Uchuvchi uni
uchish kreslosiga
bogiab turgan tasmalarga
osilmasligi uchun. sirrmoqning yuqori nuqtasida
samoiyot kamida qanday tezlikka ega boiishi
kerak (km/soat)?
A) 220 B) 120 C) 170 D) 420 E) 60
19. Massasi va radiusi Yemikidan 4 marta katta
boigan planeta uchun
birinchi kosmik tezlikni
(km/s) toping. Yer uchun birinchi kosmik tezlik 8 km/s.
A) 4 B) 8 C) 16 D) 24
20. Su'niy yo‘ldosh orbitasining radiusi 9 marta
ortsa, uning doiraviy orbita bo‘ylab aylanish davri qanday o‘zgaradi?
A) 9 marta kamayadi B) 9 marta ortadi
C) 27 marta kamayadi D) 21 marta ortadi
E) 3 marta ortadi