Billy Hill lives in an old wooden shack. The walls of his shack are made of simple wooden boards and the windows are made of thin pieces of glass. During the winter, Billy uses a fireplace to warm his shack, but a great deal of thermal energy escapes, making Billy feel cold constantly. Suggest 3 modifications that Billy could make to his shack to reduce the amount of thermal energy lost.

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)