An object whose mass is 251 kg is located at an elevation of 24 m above the surface of the earth. for g-9.78 ms, determine the gravitational potential energy of the object, in kj, relative to the surface of the earth.

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature