Physics for Scientists and Engineers
Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 17, Problem 7P
To determine

Whether the statement is true or false.

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In a shooting range, a soldier fired his rifle. If the barrel of the rifle is 58 cm long and has an opening of 275 mm, what is the average pressure of the expanding gas that propelled the 260-mg bullet? Ignore friction and assume that the speed of the bullet after passing through the length of the barrel is 375 m/s.
Consider a symmetrical U-shaped tube, of circular section and internal diameter d<<R, containing an incompressible liquid of density ρ. Before starting the rotation of the system, the system is in equilibrium, where the rotating branch has an initial height of fluid equal to L, while at the other end of the tube there is a chamber of height h and filled with a gas at initial pressure P0. The top cap of the chamber is attached to the tube. However, the bottom cap can be moved vertically acting as a “piston”, as shown in the diagram. Both the mass of the lower lid and that of the gas contained in the chamber are negligible.Suddenly the tube begins to rotate at constant angular velocity ω. About: For the initial instant find a relationship between the pressure P0 of the gas, the height h, the properties fluid physics and Patm.
Can the mean effective pressure of an automobile engine in operation be less than the atmospheric pressure?

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