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saurabh kumar Grade:
        

there are 3 liquids a,b,c of equal masses,they are at temprature10,15,25centigrade.when liquid a and b are mixed together common temprature is 12centigrade when b and c are mixed then common temprature is21centigrade.what will be the common temprature of a and c.


 

7 years ago

Answers : (1)

Anurag Kishore
37 Points
										

Hi


Use principle of calorimetry


For A and B


m sa (12 - 10) = m sb (15 - 12)


=> sa / sb = 3/2   ---------------------------------(1)


 


For B and C


m sb (21 - 15) = m sc (25 - 21)


=> sb / sc = 4/6 = 2/3 --------------------------------(2)


From (1) and (2)


sa / sc = 3/2*2/3 = 1  -----------(3)


 


Now when A and C mixed let final temp = T


m sa (T - 10) = m sc (25 - T)                          [from(3)]


=> T =35/2 = 17.5 0C


 


 


 


 


Thanks


Anurag Kishore

7 years ago
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