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Question

An aluminium piece of mass 50g initially at 300C is dipped quickly and taken out of 1kg of water, initially at 30C. If the temperature of the aluminium piece be 160C, what is the temperature of the water then (Specific heat capacities of aluminium and water are 900 JKg1K1 and 4200 Jkg1k1, respectively)


A

165C

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B

45C

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C

31.5C

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D

28.5C

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Solution

The correct option is C

31.5C


Heat lost = heat gas

0.05 × 900 × (300 - 160) = 1 × 4200 × (T - 30)

T = 31.5


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