Acopper block ( 90°c) is placed in contact with a lead block ( 20°c), which is already in contact with an iron block (70°c). which of the following will happen?

a. heat will flow from the copper to the lead and from the iron to the lead until the temperatures are equal .

b. heat will flow from the iron to the lead to the copper until the temperatures are equal.

c. heat will flow from the copper to the lead to the iron until the temperatures are equal.

d. heat will flow from the lead to the copper and to the iron until the temperatures are equal.

Option (A) is the correct answer.

Explanation:

According to zeroth law of thermodynamics, when two systems are in thermal equilibrium with the third system then all of them are in thermal equilibrium with each other.

Hence, when copper block is placed adjacent to lead block and lead block is placed adjacent to iron block then heat will flow from hotter block to the colder block.

Thus, we can conclude that heat will flow from the copper to the lead and from the iron to the lead until the temperatures are equal.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)