Molecular Physics | Thermodynamics Answers

Half a pound of gas undergoes a reversible non-flow process with the pressure remaining constant at 50 psia while the volume increases from 4 ft' to 8ft. Find the work done, Btu/lb

A bus makes a trip according to the position–time graph shown in the drawing. What is the average velocity (magnitude and direction) of the bus during each of the segments labeled A, B, and C? Express your answers in km/h.

. A turbine, operating under steady-flow conditions, receives 4500 kg of

steam per hour. The steam enters the turbine at a velocity of 2800 m/min, an elevation of 5.5 m

and a specific enthalpy of 2800 kJ/kg. It leaves the turbine at a velocity of 5600 m/min, an elevation

of 1.5 m and a specific enthalpy of 2300 kJ/kg. Heat losses from the turbine to the surroundings

amout to 16000 kJ/h.

Determine the power output of the turbine.

In an air compressor air flows steadily at the rate of 0.5 kg/s through an

air compressor. It enters the compressor at 6 m/s with a pressure of 1 bar and a specific volume

of 0.85 m3/kg and leaves at 5 m/s with a pressure of 7 bar and a specific volume of 0.16 m3/kg. The

internal energy of the air leaving is 90 kJ/kg greater than that of the air entering. Cooling water

in a jacket surrounding the cylinder absorbs heat from the air at the rate of 60 kJ/s. Calculate :

(i) The power required to drive the compressor ;

(ii) The inlet and output pipe cross-sectional areas