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Questions  

A body takes t minutes to cool from 62°C to 61°C when the surrounding temperature is 30°C. The time taken by the body to cool from 46°C to 45.5°C is 

a
greater than t minutes
b
equal to t minutes
c
less than t minutes
d
equal to t/2 minutes

detailed solution

Correct option is B

Applying Newton's law of cooling         ms62−61t∝62+612−30and  ms46−45⋅5t1∝46+45⋅52−30Solving, we get  t1=t

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A calorimeter of mass 0.2 kg and specific heat 900 J/kg/K. Containing 0.5 kg of a liquid of specific heat 2400J/kg/K. Its temperature falls from 600C to 550C in one minute. Find the rate of cooling.


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