NEET 2014 Physics question

PhysicsThermal Properties of MatterNEET 2014

Certain quantity of water cools from to in the first 5 minutes and to in the next 5 minutes. The temperature of the surroundings is

Answer: (1)

Solution

Use Newton's law of cooling in its average form: , where is the surrounding temperature. First 5 min: ... (i) Next 5 min: $ =

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Question ID VK-091490