Consider two friends who meet at a coffee shop. Both order hot coffee and both w
ID: 2220052 • Letter: C
Question
Consider two friends who meet at a coffee shop. Both order hot coffee and both want to add some almond-flavored cream (which is cool) to their hot coffee. They know that they will be so busy talking that they probably will not drink their coffees for half an hour, but they would like the coffee to still be as hot as possible when they drink it. One friend decides to add the cream to her coffee immediately, figuring that, if she cools the coffee right away, it will lose heat at a slower rate during the half-hour of chatting, and thus will be hotter in the end. The other friend decides to wait until just before she drinks the coffee to add the cream, figuring that adding cool cream to cooler coffee will make less of a temperature change in the coffee, and thus it will be hotter in the end....... a) Which friend is right? Which coffee will be hotter when they quit talking and start drinking? Why? ....... **please help will vote lifesaver!!!!****Explanation / Answer
The friend who decides to add cream before (at earlier point of time)is right. This is because according to Newton's law of cooling the rate of temperature drop will be less if the difference of temperature is less. So, the first friend is right and his/her coffee will remain hot longer