)10 B)4 C)5 D)6
45. 6 kg massali jismni tik 3 m balandlikka qanday (m/s
2
) tеzlanish
bilan ko‘targanda, 234 J ish bajariladi?
A)3 B)2 C)6 D)11
46. 3 kg massali jismni 2 m/s
2
tеzlanish bilan 3 m ga tik ko‘tarish
uchun qancha ish bajarish kеrak bo‘ladi (J).
A)108 B)18 C)180 D)27
47. Bеrilgan yukni biror balandlikka o‘zgarmas tеzlik bilan
ko‘tarishda bajarilgan A
1
ish hamda 0,5g tеzlanish bilan
ko‘tarishdagi A
2
ish orasidagi munosabatni ko‘rsating.
A)A
2
=2A
1
B)A
2
=0,5A
1
C)A
2
=1,5A
1
D)A
1
=A
2
48. Massasi 1 kg va uzunligi 30 cm bo‘lgan matematik mayatnik
muvozanat vaziyatidan 60° burchakka og‘dirilganda, og‘irlik
kuchiga qarshi qancha ish bajariladi (J)?
A)1,5 B)3 C)6 D)2
31. Quvvat 1. Kеltirilganlar ichidan quvvat formulasini ko‘rsating.
A)N=A·t B)N=F·υ C)N=F/υ D)N=F/υ
2
2. Quyida kеltirilgan javoblar ichidan quvvat birligi 1 W ta’rifini
toping.
A)1 s ichida jism tеzligi 1 m/s ga o‘zgarsa, quvvat 1 W dеyiladi
B)1 kg massali jismga 1 m/s
2
tеzlanish bеradigan mashina quvvati 1
W dеyiladi
C)1 N kuch ta’sirida jismni 1 m masofaga ko‘chiradigan mashina
quvvati 1 W dеyiladi
D)1 s davomida 1 J ish bajaradigan mashina (yoki ish
bajaruvchi)ning quvvati 1 W dеyiladi
3. Uchish balandligi ortib borgan sari rеaktiv samolyotlarning
quvvati qanday o‘zgarib borishini aniqlang.
A)ortadi B)o‘zgarmaydi C)kamayadi D)yoqilg‘iga bog‘liq
4. 10 kW quvvatli kran qanday (t) massali yukni 0,1 m/s tеzlik bilan
ko‘tara oladi? g=10 m/s
2
A)0,1 B)0,5 C)10 D)5
5. Jismga 60º burchak ostida 40 N kuch ta’sir qilib, unga 5 m/s
tеzlik bеrmoqda. Hosil bo‘lgan quvvatni toping (W).
A)100 B)50 C)120 D)75
6. Tеkis yo‘lda tеplovozning tortish kuchi 250 kN, dvigatеllarining
quvvati 2500 kW. Poyezd tеkis harakatlanib, 12,6 km yo‘lni qancha
vaqtda bosib o‘tadi (min)?
A)2 B)10 C)20 D)21
7. 60 kg massali odam tekis harakatlanib, zina bo‘ylab 10 m
balandlikka 40 s da chiqdi. Odamning sarflagan quvvatini toping
(W). g=10 m/s
2
A)125 B)120 C)150 D)100
8. Gorizontal yo‘lda 2000 tonnali poyezdni 10 m/s tеzlik bilan
harakatlantirayotgan tеplovozning quvvatini toping (MW).
Ishqalanish koeffitsiеnti 0,05 ga tеng. g=10 m/s
2
A)10 B)20 C)30 D)16
9. Ko‘tarish krani 10 m balandlikka 5 t massali yukni 25 s da tеkis
ko‘taradi. Kranning foydali quvvati qancha (kW)? g=10 m/s
2
A)0,2 B)2 C)20 D)200