When the two blocks touch each other, both blocks will have the same temperature and it will be closer to 0 degrees Celsius than 84 degrees Celsius.
option A is the correct answer.
What is the final temperature of the blocks?
The final temperature of the blocks or the equilibrium temperature of the blocks when they touch each other is determined by applying the principle of conservation of energy as follows;
Heat lost by the smaller block = Heat gained by the bigger block
m₁c(T₁ -T) = m₂c(T - T₂)
where;
- T is the equilibrium temperature of the blocks
- c is the specific heat capacity of the copper blocks
- m₁ is the mass of the smaller block
- m₂ is the mass of the bigger blocks
m₁(T₁ -T) = m₂(T - T₂)
5 x (84 - T) = 50(T - 0)
420 - 5T = 50T
420 = 55T
T = 420/55
T = 7.64⁰C
Thus, we can conclude that both blocks will have the same temperature which will be closer to 0 degrees Celsius than 84 degrees Celsius.
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