Some people believe that if by placing a cold spoon in a cup of hot coffee, it will cool it enough to drink it comfortably. Let’s test this. If you have a silver spoon that has been chilled at T= 10.0 °C (let’s say mass = 100.0 g, assume 100% Ag, specific heat =0.235 J/g °C), and you place it in a 240. mL cup of coffee that is at T= 90.0 °C (a typical temperature at a McDonald’s restaurant).
What will the final temperature of the coffee? (Food for thought, if you spill this coffee, will it be hot enough to give you 3rd-degree burns?)