What will be the change in internal energy of a system if no work is done on the system but q amount of heat is taken out from the system and given to the surroundings.

Define internal energy of a system .

The change in internaL energy of a system depends on

What is meant by internal energy of a thermodynamical system ?

The rate of change of total momentum of a many-particle system is proportional to the external force/sum of the internal forces on the system.

What is enthalpy of a system? How is it related to the internal energy?

Give the expression for potential energy of a system of two charges q_1 and q_2 in an external field.

In changing the state of a gas adiabaticaiiy from an equilibrium state A to another equilibrium state B, an amount of work equal to 22.3 J is done on the system. If the gas is taken from state A to B via a process in which the net heat absorbed by the system is 9.35 cal, how much is the net work done by the system in the latter case? (Take 1 cal = 4.19 J)

A substance absorbs heat Q_1 , in going from one state to another and releases Q_2 in coming from the second state to the first state. How much work is done by the substance and what is the change in* the internal energy of the substance.?

What are the units of heat in CGS and SI system.How are they related?

What is gravitational potential energy at a point? How much of work is done in shifting mass from the surface to a height equal to its radius?