Odpowiedzi

2009-04-25T18:51:51+02:00
M = 250 g = 0,25 kg
Q = ?
cw = 4200 J / kg*K
T₁ = 100 st. C = 373 K
T₂ = 20 st. C = 293 K
delta T = T₁-T₂
delta T = 80 K
Q = m * cw * delta T
Q = 0,25 kg * 4200 J / kg*K * 80 K = 84000 J

Odp. Odda 84000 J = 84 kJ energii.