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Q.

Take 100 g of hot water at  800C in thermos flask. Add 200 g of cold water at 200C in the thermos flask. Stir the contents and measure the temperature of the mixture. Then, the resultant temperature is [No heat lost or gained]

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a

800C

b

400C

c

200C

d

600C

answer is A.

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Detailed Solution

m1=100g,T1=800C m2=200g,T2=200C,T=? QL=Qg m1sw(T1-T)=m2sw(T-T2) 100×1(180-T)=200×1(T-20) 80-T=2T-40 3T=120 T=400C

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