A) \[45{{\,}^{o}}C\]
B) \[54{{\,}^{o}}C\]
C) \[52{{\,}^{o}}C\]
D) \[48{{\,}^{o}}C\]
Correct Answer: B
Solution :
Let the final temperature after the masses in thermal contact is \[\theta ,\] then from the principle of calorimetry. Heat lost = Heat gained \[\Rightarrow \]\[3\,ms(60-\theta )=ms(\theta -50)+ms\,(\theta -40)\] \[\Rightarrow \]\[3(60-\theta )=\theta -50+\theta -40\] \[\Rightarrow \]\[180-3\theta =2\theta -90\] \[\theta =\frac{270}{5}=54{{\,}^{o}}C\]You need to login to perform this action.
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