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Question

Two liquid with masses m1=10 kg and m2=20 kg are thoroughly mixed. If there specific heats are C1=0.2 cal/g -C and C2=0.1 cal/g -C and their temperatures are 30C and 40C respectively, then the temperature of the mixture is

A
25C
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B
35C
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C
30C
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D
28C
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Solution

The correct option is B 35C
We know,
Temperature of mixture
Tmix=m1C1T1+m2C2T2m1C1+m2C2

=10×0.2×30+20×0.1×4010×0.2+20×0.1

=35C

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