Respuesta :
Answer: copper
Explanation: when a spoon is placed in a hot coffee, the coffee will cool off based on the concept of heat transfer.
The coffee is at a higher temperature compared to the spoon, hence there is conduction of heat by the spoon from the coffee.
Heat is now transfered from the coffee to the spoon, the rate of heat transfer ( for this case coffee to spoon) is dependent on some properties but for this case, the thermal conductivity is of the most important.
A material of high thermal conductivity have a very fast rate of heat transfer and a material of low thermal conductivity have a slow rate of heat transfer.
Below is the value of thermal conductivity for copper, aluminum, iron and glass.
Copper (385 w/m.K)
Aluminum (205 W/m.K)
Iron (79.5 W/m.K)
Glass (0.8 W/m.K)
It can been seen that copper has the highest value for thermal conductivity which implies that it will conduct heat faster compared to others thus cooling the coffee faster.
The spoon made up of an aluminum material will be most effective for this purpose.
From the given information, the ability of the cup of hot coffee to be cooled is when a cold spoon is placed into it.
However, the cooling property of the hot coffee rests on the specific heat capacity of the cold spoon.
We all know that the specific heat capacity of a material is the amount of needed or required that must be removed or added from a kilogram (1 kg) of the substance to give rise to a change in temperature by 1° C.
At standard rate:
- specific heat capacity of aluminum = 0.92 kJ/kg° C
- specific heat capacity of copper = 0.39 kJ/kg° C
- specific heat capacity of iron = 0.46 kJ/kg° C
- specific heat capacity of glass = 0.84 kJ/kg° C
Therefore, the material with the highest specific heat capacity has the most effective ability to cool the hot coffee which is aluminum
Learn more about specific heat capacity here:
https://brainly.com/question/11194034?referrer=searchResults
