Explain why Two bodies at different temperatures `T_1 and T_2` if brought in thermal contact do not necessarily settle to the mean temperature `(T_1+T_2)//2`.

V-I graph for a mettalic wire at two different temperatures T_1 and T_2 is as shown in figure. WHich of the temperatures T_1 and T_2 is higher and why.

V-I graph for a metallic wire at two different temperatuare T_1 and T_2 is as shown in the following figure. Which of the two temperature T_1 and T_2 is higher and why?

If k_1 and k_2 are rate constants at temperatures T_1 and T_2 respectively, then according to Arrhenius equation,

Three copper blocks of masses M_{1}, M_{2} and M_{3} kg respectively are brought into thermal contact till they reach equilibrium. Before contact, they were at T_{1}, T_{2}, T_{3} (T_{1} > T_{2} > T_{3} ). Assuming there is no heat loss to the surroundings, the equilibrium temperature T is (s is specific heat of copper)

Two rods X and Y are of equal lengths. Each rod has its ends at temperature T_1 and T_2 . What is the condition that will ensure equal rate of flow of heat through the rods X and Y?

The current I and voltage V curves for a given metallic wire at two different temperatures T_1 and T_2 are shown in the figure. Then ,

Two perfect gases at absolute temperatures T_1 and T_2 are mixed. There is no loss of energy. Find the temperature of the mixture if the masses of the molecules are m_1 and m_2 and the number of the molecules in the gases are n_1 and n_2 respectively.