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QPage 97: Q10: HC Verma: Concepts of Physics - Volume 2 Heat Transfer Page 97: Q10 Solution: A body cools down from 65�C to 60�C in 5 minutes. It will cool…

⚠️ Common Exam Traps & Conceptual Pitfalls

Newton’s law of cooling states the rate is proportional to the instantaneous temperature difference, not to a fixed ΔT. Hence a 5 °C drop from 65 °C to 60 °C takes less time than a 5 °C drop from 60 °C to 55 °C, because the ratio ((T-T_{ ext{env}})) is larger initially. Avoid assuming a constant cooling rate.

A body cools down from 65�C to 60�C in 5 minutes. It will cool down from 60�C to 55�C in

Multiple Choice Options

  • A 5 minutes
  • B less than 5 minutes
  • C more than 5 minutes
  • D less than or more than 5 minutes depending on whether its mass is more than or less than 1 kg.

Step-by-Step Verified Solution

**Answer:** (c) more than 5 minutes. **Step-by-Step Explanation:** The rate of cooling decreases as the temperature difference decreases. So cooling from 60�C to 55�C takes more time than from 65�C to 60�C.

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