Two kilograms of air within a piston-cylinder assembly execute a carnot power cycle with maximum and minimum temperatures of 750 k and 300 k respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion, the pressure is 600 kpa and the volume is 0.4 m3.

assuming the ideal gas model for the air determine:

(a) the thermal efficiency.

(b) the pressure and the volume at the beginning of the isothermal expansion, in kpa and m3 respectively.

(c) the work and heat transfer for each of the four processes in kj.

(d) sketch the cycle on a p-v coordinates.

1. consider the case in which air fills air shocks on a truck trailer. the pressure in the shocks is 2 mpa. the temperature is 300 k. the diameter of the shock piston is 10 cm and the initial length of the cylindrical cavity containing the compressed air is 40 cm. a. the truck is gradually loaded over a period of a day in a static setting. the temperature is held constant for the atmosphere and thus for the gas shock. calculate the compressibility of the air in the shock for this condition when the truck is initially being loaded. b. if the shocks were loaded in a dynamic setting by driving over bumps, what would be the compressibility? state your assumption. c. what is the initial load on the shock if the shock is in an atmospheric 100 kpa? d. if the shock is compressed using the process described in part a, and the air shock compressed air cavity length decreases to 20 cm, what is the additional load applied to the shock?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

In which of the following is positive work done by a person on a suitcase