Two iron spheres of equal mass having temperatures `20^@C` and `48^@C` are brought into contact with each other. What is the equilibrium temperature? Assume there is no heat loss to surroundings.

Two bolcks to the same metal having same mass and at temperature T_1 and T_2 respectively ,are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure .The change in entropy , Delta S for this process is :

A 100 g cube of aluminium is removed from a bath of boiling water and dropped in a bath of room temperature water (2.00 litres at 20.0^(@)C ). What is the final temperature of the water assuming heat loss to the surroundings is negligible? The specific heat capacity of aluminium is 897 J/kg .^(@)C .

Ramu took four indentical iron balls of temperature 36^(@)C,10^(@)C,20^(@)C and 32^(@)C .He kept them in physical (thermal) contact with one another .After some time he measured the equilibrium temperautre attained by these four balls .What is the value of the equilibrium temperature?

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