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T1 = 100*C
m2 = ?
T2 = 20*C
T = 40*C
c = 4200 J/kg x *C
Qp = Qo
Qp = m2 x c x (T - T2)
Qo = m1 x c x (T1 - T)
m2 x c x (T - T2) = m1 x c x (T1 - T)
m2 x (T - T2) = m1 x (T1 - T) /: (T - T2)
m2 = m1 x (T1 - T) / (T - T2)
m2 = 0,05kg x (100*C - 40*C) / (40*C - 20*C)
m2 = 0,05kg x 60*C / 20*C
m2 = 0,15kg = 150g
/ - kreska ułamkowa
*C - stopnie Celsjusza
x - znak mnożenia