`w` is positive when the work is done on the system.

if work is done by the system then W is

What is the sign convention when work is done on the system by the surrounding?

Express the change in internal energy of a system when (i) No heat is absorbed by the system from the surroundings, but work (w) is done on the system. What type of wall does the system have ? ii) No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. What type of wall does the system have? (iii) w amount of work is done by the system and q amount of heat is supplied to the system. What type of system would it be?

In a process, a system loses 125J of heat when 400 J of work was done on the system. Calculate the change in internal energy.

If a system undergoes contraction of volume then the work done by the system will be

The change in internal energy in a reaction when 2kJ of heat is released by the system and 6 kJ of work is done on the system will be……

Change in internal energy when 4 kJ of work is done on the system and 1 kJ of heat is given out of the system is