80C coffee cooling down to the room's temperature of 26C. Draw a temperature versus time graph forthis cup of coffee and the air in the room. (7 pts)...
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<br/><br/> <br/> - 80°C coffee cooling down to the room's temperature

of 26°C. Draw a temperature versus time graph for this cup of coffee and the air in the room.

3. (7 pts) In the above scenario, the coffee lost energy. Where did that energy go? Do you think the temperature of that object/substance will increase or decrease as a result of receiving energy from the coffee?
4. (10 pts, 5 for the graph, and 5 for the labels/explanation) Consider a new scenario. You pour yourself a large cup of coffee at 80°C. You pour a small spoon of liquid creamer at 5ºC into your cup of coffee. Assume there is a temperature probe in the coffee and the creamer before and during this process. Draw a temperature versus time graph, showing both temperature probes from the time before you pour the creamer up until the system reaches equilibrium. Discuss the amount of temperature change in both the coffee and the creamer. Discuss which loses and which gains thermal energy, and compare the energy loss/gain. Justify your answers. Finally, label where thermal equilibrium occurs.


 

Subject: Physics, Science

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