Pressure (kPa) 4.0- 2.0- 0- -2.0- -4.0+ 1.0 2.0 3.0 4.0 Volume (10 m') FIGURE P12.110

An engine is design to run at 72% of Carnot engine efficiency with high and low temperature of 798 K and 293 K. The engine’s lower reservoir is at 8510 J. What is the work that can be delivered by the engine?

A gas expands from I to F in the figure below. The energy added to the gas by heat is 302 J when the gas goes from I to Falong the diagonal path. Three paths are plotted on a PV diagram, which has a horizontal axis labeled V(liters), and a vertical axis labeled P (atm). The green path starts at point I (2,4), extends vertically down to point B(2,1), then extends horizontally to point F (4,1). The blue path starts at point I (2,4), and extends down and to the right to end at point F (4,1). The orange path starts at point I(2,4), extends horizontally to the right to point A (4,4), then extends vertically down to end at point F(4,1). (a) What is the change in internal energy of the gas?J(b) How much energy must be added to the gas by heat for the indirect path IAF to give the same change in internal energy?J

What is the Carnot efficiency of a heat engine operating between the temperatures of 10 C and 100C?  Include Units .