In an isolated system where two blocks of copper are in contact, heat will flow from the hotter block to the cooler block until thermal equilibrium is reached.
In this case:
- Block 1 starts at 40°C.
- Block 2 starts at 20°C.
Since there are two blocks, when they reach thermal equilibrium, the final temperature of both blocks will be the average of their initial temperatures.
To find the ending temperature: \[ \text{Final Temperature} = \frac{\text{Temperature of Block 1} + \text{Temperature of Block 2}}{2} = \frac{40°C + 20°C}{2} = \frac{60°C}{2} = 30°C \]
Thus, both blocks will end up at 30°C.
The correct choice showing the ending temperatures is:
A. 30°C 30°C Block 1 Block 2