Miltiqdan otilganda 45 g massali o'q 600 m/s tezlik bilan uchib chiqadi. 9 g massali porox zaryadining yonishida ajralgan energiyaning necha foizini o'qning kinetik energiyasi tashkil qiladi? Poroxning solishtirma yonish issiqligi 3 MJ/kg.

  1. 15
  2. 20
  3. 25
  4. 30

📝 Detailed explanation

O'qning kinetik energiyasi:
Ek = mv²/2 = 0,045·600²/2 = 0,045·360000/2 = 8100 J.
Porox yonishida ajralgan energiya:
Q = q·m = 3·10⁶·0,009 = 27000 J.
Foiz: η = Ek/Q·100% = 8100/27000·100% = 30%.
Javob: D) 30.
6 / 30 (20%)
Question 6 of 30
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