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A) 3 B) 1 C) 2 D) 3,5
32. Bikrligi 1000 N/m bo‘lgan prujina 100 N kuch ta’sirida qanchaga cho‘ziladi?
A) 10 sm
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32. Bikrligi 1000 N/m bo‘lgan prujina 100 N kuch ta’sirida qanchaga cho‘ziladi?
A) 10 sm B) 1 mm C) 1 sm D) 1 m
33. Bikrligi 250 N/m bo‘lgan prujina F kuch ta’sirida 0,03 m ga cho‘zildi. Agar prujinaning 1/3 qismini kesib tashlab, qolgan qismiga yana shu kuch ta’sir ettirilsa, uning cho‘zilishi qanchaga (sm) teng bo‘ladi?
A) 2 B) 3 C) 1 D) 1,5
34. Mis sterjen diametri d. Sterjen o‘qi bo‘ylab yo‘nalgan kuchning qanday qiymatida undagi mexanik kuchlanish σbo‘ladi?
A) = B) = C) = D) =
35. Uzunligi 5 m va ko‘ndalang kesimi yuzi 2 mm2 bo’llgan vertikal osilgan simning uchiga 6 kg yuk osilganda u 1 mm ga cho‘zilgan. Sim materiali uchun Yung modulini (GPa) toping.
A) 100 B) 300 C) 150 D) 40.
36. Kesimi S bo‘lgan mis sim cho‘zilganida qoldiq deformatsiya kuchning F qiymatida sezildi. Misning elastiklik chegaraviy kuchlanishi (σ) aniqlansin. Mis uchun Yung moduli E.
A) σ=ES B) σ=F/S C) σ=F/ES D)σ=FS/E
37. 4 kg massali jism osilganinad 16 sm ga jo’zilgan prujinaning bikrligini aniqlang.
A) 250 N/m B) 2500 N/m C) 56 N/m D) 2,5 N/m
38. 3 kg yuk osilgan prujina 10 dm dan 2 sm ga cho’zilgan bo’lsa, uning bikirlgini toping.
A) 1,5 N/m B) 15 N/m C) 150 N/m D) 1500 N/m
39. Aravachada 6 kg massali jism aravachning bir devoriga bikrligi 1,2 kN/m bo’lgan prujina bilan maxkamlagan. Agar aravach 5 m/s2 tezlanish bilan tormuzlasa, prujina qanchaga jo’ziladi? Jism bilan aravacha orasidagi ishqalanishni hisobga olmang.
A) 0,25 m B) 2,5 sm C) 0,25 sm D) 25 mm
40. Bikeligi 200 N/m bo’lgan prujinaning yarmi qirqib olingandan so’ng uning bikrligi qanday bo’ladi?
A) 100 N/m B) 400 N/m C) 200 N/m D) 800 N/m
41. Nisbiy cho’zilishi 0,001 ga teng bo’lgan jez sterjenda 108 Pa mexanik kuchlanish hosil bo’lsa, jezning elastiklik moduli qanday( GPa)?
A ) 2 GPa B) 1 GPa C) 0,001 GPa D) 0,2 GPa
42.Rasmdagi prujinalar sistemasining bikrligi (N/m) topilsin. Ayrim holda prujinolar bikrligi 300 N/m ga teng.
A) 200 B) 900 C) 300 D) 100
4 3. Chizmada tasvirlangan bikrligi k bo’lgan prujinalarning umumiy bikirligini toping.
A) (m+n)k B) m*n*k
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