6x10 Pa b 2x10* Pa a V 2x10-4 m3 5x10-4 m3 SOLUTION IS NEEDED. A series of thermodynamics processes is shown in the pressure vs. volume graph. In the process ab, 50 J of heat is added to the system. What is the change in the internal energy in Joules in the process ab? Express your final answer in whole number. Do not type the unit in your final answer. *