Work is done by the system and heat (q) is supplied to the system. What type of system would it be?

Express the change in internal energy of a system when 1) 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 a 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 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?

Work is done by the system and 'q' amount of beat is supplied the system. What type of system would it be?

Calculate the external work done by the system in Kcal, when 40kCal of heat is supplied to the system, 8400 J of internal work is done.

Find the external work done by the system in kcal, when 20 kcal of heat is supplied to the system the increase in th internal energy is 8400 J (J=4200J/kcal)

No work is done on the system, but heat (q) is taken out from the system by the surroundings. What type of wall does the system have?