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An air pistol contains compressed air in a small cylinder,
Chapter 3, Problem 164HP(choose chapter or problem)
Problem 164HP
An air pistol contains compressed air in a small cylinder, as shown in Fig. P3.164 Assume that the volume is 1 cm3, the pressure is 1MPa, and the temperature is 27°C when armed. A bullet, with m = 15 g, acts as a piston initially held by a pin (trigger); when released, the air expands in an isothermal process (T = constant). If the air pressure is 0.1 MPa in the cylinder as the bullet leaves the gun, find
a. the final volume and the mass of air
b. the work done by the air and the work done on the atmosphere
c. the work done to the bullet and the bullet exit velocity
FIGURE P3.164
Questions & Answers
QUESTION:
Problem 164HP
An air pistol contains compressed air in a small cylinder, as shown in Fig. P3.164 Assume that the volume is 1 cm3, the pressure is 1MPa, and the temperature is 27°C when armed. A bullet, with m = 15 g, acts as a piston initially held by a pin (trigger); when released, the air expands in an isothermal process (T = constant). If the air pressure is 0.1 MPa in the cylinder as the bullet leaves the gun, find
a. the final volume and the mass of air
b. the work done by the air and the work done on the atmosphere
c. the work done to the bullet and the bullet exit velocity
FIGURE P3.164
ANSWER:
Solution 164 HP
Step 1 of 4
a)We are required to calculate the final volume and the mass of air
b)We are required to find the work done by the air and the work done on the atmosphere
c)We need to calculate the work done to the bullet and the bullet exit velocity