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JEE Main 2014 Physics question

PhysicsThermal Properties of MatterJEE Main 2014

Hot water cools from 60 °C to 50 °C in the first 10 minutes and to 42 °C in the next 10 minutes. The temperature of the surroundings is:

Answer: (2)

Solution

Newton's law in the average form gives . First interval: .

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Question ID VK-104535