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Grade: 12th pass
        
How can you best use a spoon to cool a cup of coffee? Stirring, which involves doing work, would seem to heat the coffee rather than cool it.
2 months ago

Answers : (1)

Arun
23848 Points
							
lower temperature than the coffee. Now, here the spoon acts as a cold reservoir so heat flows from coffee to spoon. Hence the temperature tends to lower down a bit.
Secondly, stirring doesn’t heat up the coffee. The concept involved here is convection. Here, while stirring, the heat currents rise up to the surface and cool due to the temperature difference between atmosphere and coffee. If you were to stir a cup of coffee in a room having temperature same as that of the coffee (though you yourself won’t survive!!), this phenomenon wouldn’t take place.
2 months ago
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Course Features

  • 110 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


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