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Cp = 4200 J/kg*K
Δt = 50 - 20 = 30K
Q = m * cp * Δt = 0.25 * 4200 * 30 = 31500 J
T1=20 stopni
T2= 50 stopni
Cw= 4200 J/kg * stopień Celsjusza
E=?
E= m*Cw*T
E= 0.25kg*4200J/kg*stopień Celsjusza*30stopni=31500J= 31,5kJ