Ishqalanish. Ishqalanish kuchi. Tabiatda va texnikada ishqalanish
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Kinetik energiya
1. Har qanday jism ham kinetik energiyaga egami? ______________________________________________________________ ______________________________________________________________ 2. Jismning kinetik energiyasi E k =2 J. Bu nimani bildiradi? ______________________________________________________________ ______________________________________________________________ 3. Nima uchun katta tezlikda haydash xavfli? Avtomobil tezligini 2 marta orttirish nimaga olib keladi? ______________________________________________________________ ______________________________________________________________ 4. m=80 kg massali, ϑ=18 km/h tezlik bilan uchayotgan qush qancha kinetik energiyaga ega? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 5. m 1 =10 g massali, ϑ 1 =500 m/s tezlik bilan uchayotgan o‘qning kinetik energiyasi va m 2 =0,6 kg massali, mixga urilayotgan onda ϑ 2 =10 m/s tezlikka ega bo‘lgan bolg‘aning kinetik energiyalari necha marta farq qiladi. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 6. F=30 N kuch bilan tinch holatidan tezlashayotgan chana s=5 m yo‘lda qancha kinetik energiyaga ega bo‘ladi? Masalani yechish ushun chananing massasini bilish kerakmi? Nima uchun? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 7. ϑ=400 m/s harakat tezligida E k =800 J kinetik energiyaga ega o‘ning massasini aniqlang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 8. m=2 t massali avtomobil tinch holatdan ϑ=36 km/h tezlikkacha tezlashganda tortish kuchi A=12 kJ ish bajardi. Bu vaqt ichida ishqalanish kuchi qancha ish bajardi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 9. Tezlashayopgan transport vositasining kinetik energiyasi nima uchun cheksiz katta qiymatga erisha olmaydi? Kinetik energiyaning qiymati manfiy bo‘lishi mumkinmi? ______________________________________________________________ ______________________________________________________________ 10. m=0,4 kg massali karton quti, h=10 m balandlikdan tushib, ϑ=10 m/s tezlikka erishdi. Havo qarshilik kuchining o‘rtacha qiymatini aniqlang. g=10 N/kg ga teng deb qabil qiling. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 11. Massasi m=800 t bo‘lgan poyezd tezligini ϑ 1 =36 km/h dan ϑ 2 = 54 km/h ga oshirganda kinetik energiyasining o‘zgarishini (∆E k ) toping. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 12. Kinetik energiyasi E k =2 kJ va massasi m=10 kg bo‘lgan jismning tezligini (ϑ) toping. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 13. Rasmda avtomobilnig harakat grafigi ko‘rsatilgan. Bu grafikdan foydalanib, harakatlanayotgan avtomobilning kenetik energiyasini aniqlang, agar uning massasi m=1 t bo‘lsa. ________________________________________________________ ____________________________________________ ____________________________________________ ____________________________________________ 14. Rasmda ko‘rsatilgan grafiklardan qaysi biri, tinch holatdan tezlashayotgan jismning kinetik energiyasi E k ni va ish A ga bog‘lanishini to‘g‘ri ko‘rsatyapti? __________________________________________ __________________________________________ __________________________________________ __________________________________________ 15. m=4 t massaga ega yukli avtomobilning harakt tezligi s=25 m yo‘lda tezligi ϑ 1 =36 km/h dan ϑ 2 =54 km/h gacha ortdi. Avtomobil dvigatelining tortish kuchini va shu kuch bajargan ishni toping. Harakatga qarshilikni hisobga olmang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 16. Ikkita bir xil aravacha 36 km/h va 54 km/h tezlikda harakatlanadi. Ularning kinetik energiyalari necha marta farq qiladi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 17. Massasi 1 kg bo‘lgan jism 2 m/s tezlik bilan harakat qiladi. Uning kinetik energiyasi qanday? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 18. 5 m/s tezlikda harakatlanayotgan jismning kinetik energiyasi 50 J bo‘lsa, uning massasini toping. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ Download 1.87 Mb. Do'stlaringiz bilan baham: 
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