Question
12.Three liquids with masses M1,M2 and M3 are thoroughly mixed.If their specific heats are S1,S2 and S3 and initial temperatures are T1,T2 and T3 respectively,then the equilibrium temperature of the mixture is 1) M1T1+M2T2+M3T3S1T1+S2T2+S3T3 2) M1S1+M2S2+M3S3÷ S1T1+S2T2+S3T3 3) M1S1T1+M2S2T2+M3S3T3÷ M1S1+M2S2+M2S3 4) M1S1T1+M2S2T2+M3S3T3÷ M1T1+M2T2+M3T3