11-sinf Fizika olimpiada №2

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11-sinf Fizika olimpiada №2

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1. Vertikal silindrdagi erkin ko`cha oladigan porshen ostida 1 mol bir atomli ideal gaz bor. Gazning bosimi 200 kPa. Agar gazga 6 kJ issiqlik miqdori berilsa, uning hajmi necha litrga ortadi?

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2. 800 g massali yuk prujinaga mahkamlangan bo’lib, x = 0.2sin12t (m) tenglamaga muvofiq garmonik tebranmoqda. Yukning maksimal kinetik energiyasi (J) qanday?

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3. Oydagi portlash yerda eshitlishi mumkinki?

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4. Bir atomli 1 mol gaz izobarik kengayganda160 J ish bajaradi va temperaturasi 100C gaortadi. Gazga qancha issiqlik miqdori (J)berilgan?

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5. Tekis harakatlanib tushayotgan aerostat xuddi shunday tezlikda yuqoriga ko'tarila boshlashi uchun, aerostatdan qancha og’irlikdagi ballastni (yukni) tashlab yuborish kerak?(kg) Aerostatning ballast bilan birga og’irligi 16 kN, yuqoriga ko'rsatuvchi kuchi 12 kN. Yuqoriga ko'tarilishda va tushishida havoning qarshilik kuchi birday hisoblansin.

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6. Aylanma harakat qilayotgan g’ildirak gardishi nuqtasining υ1 chiziqli tezligi gardishdan o’qqa 5 sm yaqin bo’lgan nuqtasining υ2 chiziqli tezligidan 2,5 marta katta bo’lsa, g’ildirakning radiusi topilsin. (cm)

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7. A jism υ1 boshlang’ich tezlik bilan yuqoriga otilgan vaqtda, h balandlikdan υ2=0 boshlang’ich tezlik bilan B jism pastga tushib keladi. Agar jismlar bir vaqtda harakatlangan bo’lsa, A va B jismlar orasidagi x masofaning t vaqtga bog’lanishi topilsin.

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8. Kir yuvish mashinasining 40 sm diametrli bakiga sovunli suv quyilgan (σ=40 MN/m). Bu suv sirt qatlamining  energiyasini aniqlang.(mJ)

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9. υ=600 m/sek tezlik bilan uchayotgan m=4,65·10-26 kg massali molekula normalga nisbatan idish devoriga 600 burchakda uriladi va shunday burchakda tezligini o'zgartmay elastik qaytadi. Urilish vaqtida idish devoriga berilgan kuch impulsi topilsin

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10. 0,02 lm yorug’lik oqimi yuzi 5 sm2 bo’lgan sirtga perpendikular tushmoqda. Sirtning yoritilganligi qanday?

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11. Doimiy tok manbaiga ulangan yassi havo kondensatorining plastinkalari orasi dielektrik singdiruvchanligi Ԑ=10 bo`lgan muhit bilan to`ldirildi. Bunda plastinkalar orasidagi ta’sir kuchi qanday o`zgaradi?

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12. Metropoliten ikki stansiyasining oralig’i 1,5 km. Poyezd bu masofaning birinchi yarmida tekis tezlanuvchan, qolgan ikkinchi yarmida tekis sekinlanuvchan harakat qiladi. Poyezdning maksimal tezligi 50 km/soat ga teng. Bu tezlanuvchan va sekinlanuvchan harakatning tezlanishlarini modul jihatdan teng bo`lsa,poyezdning ikki stansiya orasidagi harakat vaqti topilsin.(min)

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13. Zaryadlangan shar sirtidan uning radiusiga teng masofaga uzoqlashilsa, elektr maydon potensiali qanday o’zgaradi?

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14. Oyning siderik davri qancha?

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15. Bo`ylama to`lqinda muhit zarrachalari qanday yo`nalishda tebranadilar?

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16. Idishdagi gazning hajmi o‘zgarmas temperaturada 5% ga kamayishi uchun gaz bosimini necha foizga orttirish kerak?

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17. R radiusli metal shar bir jinsli hajmiy zaryadga ega. Quyidagi qaysi grafik sharning elektr maydon kuchlanganligining masofaga bog’liqligini ifodalaydi?

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18. Quyidagi moddalardan qaysi birining elektr o’tkazuvchanligi eng kichik?

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19. Jism  h=19,6 m balandlikdan boshlang’ich tezliksiz tushmoqda. Jism o'z harakatining oxirgi 0,1 sekundda qanch yo`l o`tadi? Havoning qarshiligi hisobga olinmasin.

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20. Bir xil temperaturada turgan geliy (v₁), neon  (v₂ ) va argon (v₃) gazlari atomlarining issiqlik harakati o‘rtacha kvadratik tezliklarini  taqqoslang. Ularning nisbiy atom massalari quyidagicha: geliyniki - 4 m.a.b., neonniki -  20 m.a.b. va argonniki - 40 m.a.b.

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21. O’zgarmas tok manbaiga ulangan yassi kondensator plastinkalari orasidagi masofa 2 marta kamaytirilsa, elektr maydon energiyasi o’zgaradimi?

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22. Tosh gorizontal yo'nalishda 10 m/sek tezlik bilan otilgandan 3 sek o'tgach, tosh trayektoriyasining egrilik radiusi topilsin. Havoning qarshiligi hisobga olinmasin.

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23. Ikkita bir xil spiral 5 V li o’zgarmas kuchlanish tarmog’iga ketma-ket ulangan. Agar birinchi spiralning uzunligi 1,5 marta qisqartirilsa, uning uchlaridagi potensiallar farqi necha voltga teng bo’ladi?

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24. Shishadan fokus masofasi 20 sm bo‘lgan qavariqlinza tayyorlandi. Linzaning egrilik radiuslariteng. Shishaning nur sindirish ko‘rsatkichi 1,5ga teng bo‘lsa egrilik radiusini (sm) toping.

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25. Gaz  PV²=const tenglamaga muvofiq siqilmoqda.  Bunda uning temperaturasi qanday o‘zgaradi?

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