A system absorb 20 kJ heat and also does 10 kJ of work. The net internal energy of the system is :-

(1) increases by 10 kJ
(2) decreases by 10 kJ
(3) increases by 30 kJ
(4) decreases by 30 kJ

Asked by Atulcaald | 25th May, 2018, 12:31: AM

Expert Answer:

Option (1) is correct.
Internal energy increases by 10 kJ.
 
increment straight U space equals space straight q plus space straight W

space space space space space space space equals space 20 space plus open parentheses negative 10 close parentheses

space space space space space space space equals space 10 space space kJ

Answered by Varsha | 25th May, 2018, 11:51: AM