Question

What is AU for the process described by figure. Heat
supplied during the process q = 100 kJ.

(A) + 50 kJ
(C)-150 kJ
(B)- 50 kJ
(D) + 150 kJ​

Answer 1

Explanation:

work done = area under the curve

= 1/2 * (2-1)*(2-1)*10^5

W = 0.5*1*10^5 = 50 kJ

as per first law of thermodynamics

AU (internal energy) = q-W

= 100 - 50 = +50 kJ

hence A option is correct