Question

An ideal gas is taken through the cycle A® B ® C ® A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C ® A is

• A. –5J
• B. –10 J
• C. –15 J
• D. – 20 K

Answer 1

Answer: (A)

–5J

Answer 2

(DU)_net = 0, (DQ)_net= (DW)_net

= W_AB + W_BC + W_CA

5 = 10 × 2 + 0 + W_CA Ž W_CA = –15 J