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Massasi 2 kg bo`lgan jism yerga qanday kuch bilan tortiladi?
A) 2 N B) 9,8 N C) 19,6 N D) 98 N
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| bet | 3/4 | | Sana | 06.09.2022 | | Hajmi | 59 Kb. | | #25643 |
Bog'liq 4. Mexanika 2.125. Massasi 2 kg bo`lgan jism yerga qanday kuch bilan tortiladi?
A) 2 N B) 9,8 N C) 19,6 N D) 98 N
26. Tayanchga osilgan jismga bog`langan ip pastga qarab 8 N kuch bilan 5 s davomida tortib turildi. Jismga ta`sir etgan kuch impulisini toping?
A) 8 N·s B) 5 N·s C) 40 N·s D) 400 N·s
27. Quydagi keltirilgan ifodalardan qaysi biri dumalanish ishqalanish kuchi formulasini ko`rsating.
A) Fishq= dN/R B) Fishq= sN C) Fishq= d N D) F=-kx
28. Ishqalanish kuchini kamaytirish uchun texnikada qanday ish bajarili mumkin?
A)Tozalash B)moylash C)ishqalash D)yuvish E)T.J.Y
29. Quyidagi formulalardan qaysilari markazga intilma tezlanish qatnashganligini ko`rsating?
1. 2. 3. 4. 5. 6.
A) 1,2,3,4,5 B) 3,4 C) 2,3,4,5 D) 2,3,4,5,6
30. Yer sirtidan uning radiusiga teng balandlikda erkin tushish tezlanishi nimaga teng (m/s2)?
A) 9,81 B) 10 C) 4 D) 2,5
31. Bikrligi K1= 250 N/m va K2= 750 N/m bo’lgan prujinalar o`zaro ketma–ket ulansa ularning
umumiy bikrligi nimaga teng bo`ladi?
A) 187,5 B) 1000 C) 750 D) 250
32. Gidravlik press kichik porshenining yuzi 25sm2. Katta porshenining yuzi 300 sm2bo`lsa, bunday press kuchdan necha marta yutuq beradi?
A) 5 B) 10 C) 12 D) 25
33. Ko`tarish krani dvigatelining quvvati 5000W. Kran 800 kg yukni 10 m balandlikka 20 s davomida ko`taradi. Dvigatelning foydali ish koeffisiyentini aniqlang (%).
A) 87,5 B) 100 C) 75 D) 80
34. Jismning aylana bo`ylab harakatida uning aylanish radiusi 2 marta ortib, tezligi 2 marta kamaysa, uning aylanish chastotasi qanday o`zgaradi?
A) 4 marta ortadi B) 4 marta kamayadi C) 2 marta ortadi D) o’zgarmaydi
35. Tekis tezlanuvchan harakat qilayotgan jismning boshlang`ich tezligi 5m/s, tezlanishi esa 3m/s2 bo`lib, u 24 m yo`l yurgan. Jismning oxirgi tezligini toping (m/s)
A) 15 B) 8 C) 10 D) 13
36. Aylana bo`ylab tekis harakat qilayotgan jismning aylanish chastotasi 7 marta ortsa, aylana radiusi 49 marta kamaysa, jismning markazga intilma tezlanishi qanday o`zgaradi?
A) 49 marta ortadi B) 7 marta kamayadi C) 7 marta ortadi D) o’zgarmaydi
M-2.1 test kalitlari
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