Massasi m=42 kg bo'lgan toshni necha kilometr balandlikka ko'targanda, uning potensial energiyasi t₁=0°C temperaturadagi V=1 l suvni qaynatish (t₂=100°C) uchun kerak bo'lgan energiyaga teng bo'ladi? c=4200 J/(kg·K), ρ=1000 kg/m³.
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📝 Detailed explanation
Ep = mgh va Q = cρV(t₂–t₁) tenglashtirамиз.mgh = cρV(t₂–t₁)
h = cρV(t₂–t₁)/(mg) = 4200·1000·10⁻³·(100–0)/(42·10) = 420000/420 = 1000 m = 1 km.