1- Which of the following statements is true about two objects in thermal equilibrium?

a. The thermal energies for the two objects are equal.
b. The net flow of heat energy between the two objects is zero.
c. The two objects are at different temperature.
d. There is a net flow of heat energy from one object to the other.

Which of the following statements is true about two objects in thermal equilibrium?

a. The thermal energies for the two objects are equal.
b. The net flow of heat energy between the two objects is zero.
c. The two objects are at different temperature.
d. There is a net flow of heat energy from one object to the other.

The statement that is true about two objects in thermal equilibrium is:

b. The net flow of heat energy between the two objects is zero.

To determine which statement is true about two objects in thermal equilibrium, let's analyze each statement:

a. The thermal energies for the two objects are equal.
In thermal equilibrium, the thermal energies of the two objects are indeed equal. However, this statement alone does not cover all aspects of thermal equilibrium, so it may not be the only correct answer.

b. The net flow of heat energy between the two objects is zero.
This statement is true for objects in thermal equilibrium. In thermal equilibrium, there is no net flow of heat energy between objects. While thermal energy may still be transferred between the objects, the rate at which energy is exchanged is equal in both directions, resulting in a zero net flow.

c. The two objects are at different temperatures.
This statement is not true for objects in thermal equilibrium. In thermal equilibrium, the two objects are at the same temperature. If they were at different temperatures, there would be a net flow of heat energy until an equilibrium is reached.

d. There is a net flow of heat energy from one object to the other.
This statement is not true for objects in thermal equilibrium. In thermal equilibrium, there is no net flow of heat energy between the objects. Heat energy can still be exchanged, but the rates at which energy enters and leaves each object are equal.

Therefore, the correct statement about two objects in thermal equilibrium is:
b. The net flow of heat energy between the two objects is zero.

I don't like any of the choices.