A vessel contains M grams of water at a certain temperature and water at certain other temperature is passed into it at a constant rate of `mg//s`. The variation of temeprature of the mixture with time is shown in Fig. The values of M and m are, respectively (the heat exhanged after a long time is 800 cal)A. 40 and 2B. 40 and 4C. 20 and 4D. 20 and 2

A vessel contains M grams of water at a certain temperature and water

1.	A vessel contains M grams of water at a certain temperature and water at certain other temperature is passed into it at a constant rate of `mg//s`. The variation of temeprature of the mixture with time is shown in Fig. The values of M and m are, respectively (the heat exhanged after a long time is 800 cal)A. 40 and 2B. 40 and 4C. 20 and 4D. 20 and 2
Answer» Correct Answer - B Evidently the initial temperature of the water contained in the vessel (Mg) is `80^@C` and the temperature of the water passed into it is `60^@C` as the final temperature of the mixture tends to attain a value of `60^@C` `Mxx1(80-70)=mxx10xx1(70-60)` or `M//m=10` since the heat exhanged after a long time is 800 cal. `(Mg)(1cal//(m^(@)C)(80-60^(@)C)=80cal` or `M=40g` `implies m=4g`

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