1–33

1–33 Consider two closed systems A and B. System A contains 3000 kJ of thermal energy at 20°C, whereas system B
contains 200 kJ of thermal energy at 50°C. Now the systems
are brought into contact with each other. Determine the direction of any heat transfer between the two systems.
ANS
1-33Two systems having differenttemperatures and energy contents are brought in contact. The direction
ofheat transfer is tobedetermined.
Analysis Heat transfer occurs fromwarmer tocooler objects.  Therefore, heat will betransferredfrom
systemB to systemA until both systems reach the sametemperature.