A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in ______________ minutes?
Correct answer: B. > 10
- A. 10
- B. > 10
- C. < 10
- D. Either B. or C., depends on the mass of the body
Explanation
Under Newton’s law of cooling, the cooling rate decreases as the body approaches its surroundings’ temperature. Therefore, after cooling from 75°C to 70°C, the next 5°C drop takes more than 10 minutes.
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