(a)
Interpretation:
The force in (lbf) exerted on the gas through the atmosphere, the piston, and the weight should be calculated assuming there is no friction between cylinder and the piston.
Concept Introduction:
The area of cross-section of the cylinder can be calculated using the following formula:
Here, d is diameter of the cylinder.
The force exerted by atmosphere can be calculated as follows:
Here,
Also, force exerted by piston and weight can be calculated as follows:
Here, m is total mass of piston and weight and g is acceleration due to gravity.
Similarly, total force will be sum of atmospheric force and force exerted piston and weight.
(b)
Interpretation:
The pressure of the gas is psia should be determined.
Concept Introduction:
Pressure of gas can be calculated using the following formula:
Here, F is total force and A is area.
Also, 1 psia= 1 lbf/ft2
(c)
Interpretation:
The work done by the gas in ft/lbf and the potential energy change of the piston and weight should be determined.
Concept Introduction:
The work done by the gas can be calculated using the following formula:
Here, F is force and
Also, the change in potential energy of the piston and weight can be calculated as follows:
Here, m is mass, g is acceleration due to gravity and
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Chapter 1 Solutions
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