Chapter 8, Problem 8.109EP

21. Find the change in internal energy of 5lbm of oxygen gas when the temperature changes from 0.157BTU 100°F to 120°F, c lbm-R V

Solve it correctly and fast please.

THERMODYNAMICS A certain gas expand from 7ft3 to 23ft3 while the pressure remains constant at 17.5psia. Find the work nonflow in the system in BTU.

A cycle heat engine does 60KJ of work per cycle. If th efficiency of the heat engine is 60%. The heat rejected per cycle is?

In an engine, the air in a piston-cylinder arrangement has a compression ratio of 0.1. It starts from 100kPa and 20degC. Find the temperature at state 2. You can assume an adiabatic process and the ideal gas law applies.

A rigid insulated tank is separated into two rooms by a stiff plate. Room A of 0.5 m 3 contains air at 250Kpa, 300 K and room B is 1 m 3 has air at 200 Kpa, 1000 K. the plate is removed and the air comes to auniform state without any heat transferred. find the final temp and pressure of the room.

9. Air is expanded from 400 kPa, 600 K in a polytropic process to 150 kPa, 400 K in a piston cylinder arrangement. Find the polytropic exponent n and the work and heat transfer per kg air using constant heat capacity.

During a non-flow isentropic process of 2 kg of air, the temperature increases from 45oC to 70oC. Find the change of internal energy. a. 24.3 kJ     b. 40.5 kJ     c. 55.9 kJ     d. 35.9 kJ

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