Three copper blocks of masses M1, M2 and M3 kg respectively are brought into thermal contact till they reach equilibrium. Before contact, they were at T1, T2, T3 (T1 > T2 > T3 ). Assuming there is no heat loss to the surroundings, the equilibrium temprature T is (s is specific heat of copper)
1
\(T = \frac{{{T_1} + {T_2} + {T_3}}}{3}\)
2
\(T = \frac{{{M_1}{T_1} + {M_2}{T_2} + {M_3}{T_3}}}{{{M_1} + {M_2} + {M_3}}}\)
3
\(T = \frac{{{M_1}{T_1} + {M_2}{T_2} + {M_3}{T_3}}}{3({{M_1} + {M_2} + {M_3}})}\)
4
\(T = \frac{{{M_1}{T_1s} + {M_2}{T_2s} + {M_3}{T_3s}}}{{{M_1} + {M_2} + {M_3}}}\)