### Constant volume with decreasing pressure

Assignment Help Basic Statistics
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1. An airplane takes off from a coastal city where the air temperature is 20 °C (68 °F) and climbs to cruising altitude. At what altitude will the outside temperature be 0 °C?

(Assume that there is no temperature inversion like those which occur in the Los Angeles area.)

2. Consider a cyclic equilibrium process made up of following sub processes:

→ is isothermal with increasing volume;

→ is at constant volume with decreasing pressure;

(a) Sketch the process on a PV diagram.

(b) Complete the following table with numerical values. (Use a separate piece of paper.) Justify your answers, and use the numbers in the table to identify your justifications.

 Sub process Q ΔU W a → b 3600 J (3) (7) b → c (1) (4) (8) c → a 0 (5) -1200 J Complete cycle (2) (6) (9)

(c) Find the energy efficiency of the process.

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