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W = Q
P = W / t
W = P * t
Q = m * cw *ΔT gdzie ΔT = Tk - T p
P * t = m * cw * ( Tk - Tp )
cw = P * t / m * ( Tk - Tp )
cw = = 2000 J/s * 90 s / 1 kg * ( 55 C - 25 C )
cw = 6000 J /kg * C