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?)

Explanation:

There are two heat transfers involved: the heat gained by the spoon and the heat lost by the coffee.

According to the Law of Conservation of Energy, energy can neither be destroyed nor created, so the sum of these terms must be zero.

Let the spoon be Component 1 and the coffee be Component 2.

Data:  

For the spoon:

For the coffee:

Calculations

1. The relative temperature changes

2. Final temperature of coffee

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation:

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