Ishqalanish. Ishqalanish kuchi. Tabiatda va texnikada ishqalanish
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Quvvat. Quvvat birliklari
1. Quvvat nimani tavsiflaydi? ______________________________________________________________ ______________________________________________________________ 2. Quvvat XBS da qanday birliklarda o‘lchanadi? ______________________________________________________________ ______________________________________________________________ 3. Gapni qanday tushunish kerak: “Bir qurilmaning quvvati boshqasinikidan 2 marta katta”? ______________________________________________________________ ______________________________________________________________ 4. Tasdiq to‘g‘rimi: “Quvvatning qiymati ishga to‘g‘ri proportsional va vaqt oralig‘iga teskari proportsional”? Nima uchun? ______________________________________________________________ ______________________________________________________________ 5. Kichik quvvatli mexanizm katta ish bajarishi mumkinmi? ______________________________________________________________ ______________________________________________________________ 6. Nima uchun yengil avtomobildan foydalanib yer haydab bo‘maydi, axir bu ishni bajaruvchi minitraktor dvigatelidan uning dvigateli quvvatliroqku? ______________________________________________________________ ______________________________________________________________ 7. O‘zbekiston temir yo‘llarida qatnaydigan “Afrosiyob” elektropoyezdining dvigateli t=1 min vaqtda A=150 MJ ish bajardi. Dvigatelning quvvatini aniqlang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 8. N=59 kW quvvatli “TTz-80.10” traktori t=1 h vaqtda qancha ish bajaradi? Jovobni J va kW ⋅h larda yozing. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 9. m=80 kg massali sportchi arqon bo‘ylab h= 4 m balandlikka qancha vaqtda yetib borishi mumkin, agar uning erishgan maksimal quvvati N=0,80 kW ga teng bo‘lsa. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 10. Avtomobil ϑ=72 km/h o‘zgarmas tezlik bilan harakatlanganda qarshilik kuchi qancha bo‘ladi? Avtomobil dvigatelining quvvati N=60 kW. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 11. m=4 t massali yukli avtomobil ϑ=54 km/h o‘zgarmas tezlik bilan harakatlanyapti. Avtomobil harakatiga qarshilik kuchi uning og‘irligining 0,10 qismini tashkil qiladi. Avtomobil dvigateli erishgan quvvatni aniqlang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 12. Transportyor t=1 soatda V=240 m 3 shag‘alni h=6 m balandlikka chiqardi. Bu ishni bajarish uchun dvigatelning quvvati (N) qanday bo‘lishi kerakligini aniqlang. (Shag‘alning zichligi ρ=1,7 g/cm 3 ). ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 13. Yuk ko‘taradigan mashina dvigatelining quvvati N=4 kW. U t=2 minutda h=15 m balandlikka qanday yukni (m) ko‘tarishi mumkin? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 14. Olimlar kit suv ostida ϑ=27 km/h tezlik bilan suzganda uning N=150 kW quvvatga etishini hisoblagan. Kitning harakatiga bo‘lgan suvning qarshilik kuchini (F q ) aniqlang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 15. Lift dvigatelining quvvati 8 kW. U 1 daqiqada qanday yukni 15 m balandlikka ko‘tara oladi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 16. Massasi 60 kg bo‘lgan sportchi 0,9 kW quvvatga ega bo‘lsa, arqonni 2 s da qanday balandlikka ko‘tara oladi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 17. 100 kW quvvatli avtomobil dvigateli 12 MJ ishni qancha vaqt ichida bajaradi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 18. Nasos quvvati 1,5 kW bo‘lsa, 12 m chuqurlikdagi quduqdan 9 t suvni qancha vaqt ichida haydab chiqadi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 19. Yong‘in nasosi 6 kW quvvatga ega. Nechanchi qavatga har daqiqada 1500 litr suvni chiqrib bera oladi? Qavatlar orasidagi masofa 3 m. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 20. Filni 100 W quvvatga ega dvigatel bilan to‘rtinchi qavatga ko‘tarish uchun qancha vaqt kerak bo‘ladi (bu qahva maydalagich motorining kuchi)? Qavatlar orasidagi balandlik 3 m, filning og‘irligi 4 tonna. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 21. Metro eskalatori 1 minutda 100 nafar yo‘lovchini 20 m balandlikka ko‘taradi. Yo‘lovchining massasi 70 kg, avtomobilning quvvati esa 70 kW deb faraz qilib, eskalatorning kuchini avtomobil kuchi bilan solishtiring. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 22. Suratda dunyodagi eng katta An-225 samolyoti ko‘rsatilgan. Uning oltita dvigatelining har biri 220 m/s tezlikda parvoz qilganda 10 MW quvvatga ega bo‘ladi. Ushbu dvigatellarning umumiy quvvati qancha? Parvoz paytida samolyotga ta’sir qilayotgan havoning qarshilik kuchini aniqlang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 23. Teplovozning tortish kuchi (rasmga.q) 72 kN. Dvigatel quvvati 3000 kW. Poyezd 15 km masofani qancha vaqt ichida bosib o‘tadi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 24. GESning balandligi 12 m (rasmga.q), suv oqimining quvvati 3 MW. 1 minutda to‘g‘ondan tushayotgan suv hajmini toping. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 25. Shlyuzdan suv chiqarilganda uning kameradagi suvning sathi (rasmga.q) 36 m ga pasayadi. Shlyuz kameraning uzunligi 250 m, kengligi 20 m bo‘lsa, bu holatda og‘irlik kuchi qanday ish bajaradi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ Download 1.87 Mb. Do'stlaringiz bilan baham: 
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