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JEE Main201815 Apr 2018Evening ShiftPhysicsThermal Properties of MatterActual

A body takes 10 minutes to cool from 60^ C to 50^ C . The temperature of surroundings is constant at 25^ C . Then, the temperature of the body after next 10 minutes will be approximately

Options

  1. A43^ C
  2. B47^ C
  3. C41^ C
  4. D45^ C

Correct answer

A. 43^ C

Step-by-step solution

According to Newton's law of cooling, aligned & ( ₁- ₂ t )=K ( ₁+ ₂ 2 - ₀ ) & ( 60-50 10 )=K ( 60+50 2 -25 ) & and, ( 50- 10 )=K ( 50+ 2 -25 ) aligned Dividing eq. (i) by (ii), 10 (50- ) = 60 =42.85^ C 43^ C

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