12. Aditya is stacking some cups. The diagram above shows the cups before they touch each other. Use the information in the diagram to answer the question. After the cups have been touching for a while, which of the two bottom cups will be cooler, and why?

0.13J/g°C

Explanation:

Given parameters:

Mass  = 345g

Initial temperature  = 45°C

Final temperature  = 72°C

Quantity of heat  = 1215J

Unknown:

Specific heat of lead  = ?

Solution:

To solve this problem, we use the expression below:

       H  = mass x specific heat capacity x (Final - initial temperature)

Now insert the parameters and solve;

     1215  = 345 x Specific heat x (72  - 45)

     1215  = 9315 x specific heat

       Specific heat  = 0.13J/g°C