Answers to part a [N94/2/1]A projectile of mass 3.2 x 10-2 kg is fired from a cylindrical barrel of cross-sectional area2.8 x 10-4 m2 by means of compressed air. The variation with time of the excess pressure p ofthe gas in the barrel above atmospheric pressure is shown in the figure below.605040p/MPa3020101.02.03.04.0t/ms(a)Calculate(i)the maximum force exerted on the projectile,(ii)the acceleration of the projectile which would result from the force calculated in(i).(b)From the graph, estimate the total change in momentum experienced by theprojectile, due to the compressed gas.(c)The speed of the projectile changes from zero to 270 m s-1 as it leaves the barrel.What is the change in momentum of the projectile?(d) Compare your answers in (b) and (c) and suggest a possible reason for thedifference.

Given data: The mass of projectile is m=3.2×10-2 kg. The cross-sectional area is A=2.8×10-4 m2.

[N94/2/1] A projectile of mass 3.2 x 10-2 kg is fired from a cylindrical barrel of cross-sectional area 2.8 x 104 m2 by means of compressed air. The variation with time of the excess pressure p of the gas in the barrel above atmospheric pressure is shown in the figure below. 60 50 40 p/MPa 30 20 10 1.0 2.0 3.0 4.0 t/ms (a) Calculate (i) the maximum force exerted on the projectile, the acceleration of the projectile which would result from the force calculated in (ii) (i). (b) From the graph, estimate the total change in momentum experienced by the projectile, due to the compressed gas. (c) The speed of the projectile changes from zero to 270 m s1 as it leaves the barrel. What is the change in momentum of the projectile? (d) Compare your answers in (b) and (c) and suggest a possible reason for the difference.

[N94/2/1] A projectile of mass 3.2 x 10-2 kg is fired from a cylindrical barrel of cross-sectional area 2.8 x 104 m2 by means of compressed air. The variation with time of the excess pressure p of the gas in the barrel above atmospheric pressure is shown in the figure below. 60 50 40 p/MPa 30 20 10 1.0 2.0 3.0 4.0 t/ms (a) Calculate (i) the maximum force exerted on the projectile, the acceleration of the projectile which would result from the force calculated in (ii) (i). (b) From the graph, estimate the total change in momentum experienced by the projectile, due to the compressed gas. (c) The speed of the projectile changes from zero to 270 m s1 as it leaves the barrel. What is the change in momentum of the projectile? (d) Compare your answers in (b) and (c) and suggest a possible reason for the difference.

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter14: Fluid Mechanics

Section: Chapter Questions

Problem 14.39P: How many cubic meters of helium are required to lift a light balloon with a 400-kg payload to a...

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