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 ?

Express the change in internal energy of a system when (i) No heat is

1.	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 ?
Answer» Solution :(i) `Delta U = W_(AD)`, wall is ADIABATIC (ii) `Delta U - q,` thermally conducting WALLS (iii) `Delta U = q-W`, closed for system