A 39.0-g projectile is launched by the expansion of hot gas in an arrangement shown in figure a. The cross-sectional area of the launch tube is 1.0 cm2, and the length that the projectile travels down the tube after starting from rest is 32 cm. As the gas expands, thepressure varies as shown in figure b. The values for the initial pressure and volume are P, = 15 x 105 Pa and V, = 8.0 cm3 while the final values are P; = 1.5 x 105 Pa and V; = 40.0 cm³. Friction between the projectile and the launch tube is negligible.PP;32 cmGasPf- 8 cm -VV;(a) If the projectile is launched into a vacuum, what is the speed of the projectile as it leaves the launch tube?m/s(b) If instead the projectile is launched into air at a pressure of 1.5 x 105 Pa, what fraction of the work done by the expanding gas in the tube is spent by the projectile pushing air out of the way as it proceeds down the tube?spent =env

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A 39.0-g projectile is launched by the expansion of hot gas in an arrangement shown in figure a. The cross-sectional area of the launch tube is 1.0 cm?, and the length that the projectile travels down the tube after starting from rest is 32 cm. As the gas expands, pressure varies as shown in figure b. The values for the initial pressure and volume are P, = 15 x 10s Pa and V, = 8.0 cm while the final values are P, = 1.5 x 105 Pa and V, = 40.0 cm. Friction between the projectile and the launch tube is negligible. M 32 cm Gas P - 8 cm - V (a) If the projectile is launched into a vacuum, what is the speed of the projectile as it leaves the launch tube? m/s (b) If instead the projectile is launched into air at a pressure of 1.5 x 10° Pa, what fraction of the work done by the expanding gas in the tube is spent by the projectile pushing air out of the way as it proceeds down the tube? "spent

A 39.0-g projectile is launched by the expansion of hot gas in an arrangement shown in figure a. The cross-sectional area of the launch tube is 1.0 cm?, and the length that the projectile travels down the tube after starting from rest is 32 cm. As the gas expands, pressure varies as shown in figure b. The values for the initial pressure and volume are P, = 15 x 10s Pa and V, = 8.0 cm while the final values are P, = 1.5 x 105 Pa and V, = 40.0 cm. Friction between the projectile and the launch tube is negligible. M 32 cm Gas P - 8 cm - V (a) If the projectile is launched into a vacuum, what is the speed of the projectile as it leaves the launch tube? m/s (b) If instead the projectile is launched into air at a pressure of 1.5 x 10° Pa, what fraction of the work done by the expanding gas in the tube is spent by the projectile pushing air out of the way as it proceeds down the tube? "spent

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

A 39.0-g projectile is launched by the expansion of hot gas in an arrangement shown in figure a. The cross-sectional area of the launch tube is 1.0 cm2, and the length that the projectile travels down the tube after starting from rest is 32 cm. As the gas expands, the
pressure varies as shown in figure b. The values for the initial pressure and volume are P, = 15 x 105 Pa and V, = 8.0 cm3 while the final values are P; = 1.5 x 105 Pa and V; = 40.0 cm³. Friction between the projectile and the launch tube is negligible.
P
P;
32 cm
Gas
Pf
- 8 cm -
V
V;
(a) If the projectile is launched into a vacuum, what is the speed of the projectile as it leaves the launch tube?
m/s
(b) If instead the projectile is launched into air at a pressure of 1.5 x 105 Pa, what fraction of the work done by the expanding gas in the tube is spent by the projectile pushing air out of the way as it proceeds down the tube?
spent =
env

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