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Question
Military rifles have a mechanism for reducing the recoil forces of the gun on the person firing it. An internal part recoils over a relatively large distance and is stopped by damping mechanisms in the gun. The larger distance reduces the average force needed to stop the internal part. (a) Calculate the recoil velocity of a 1.00-kg plunger that directly interacts with a 0.0200-kg bullet fired at 600 m/s from the gun. (b) If this part is stopped over a distance of 20.0 cm, what average force is exerted upon it by the gun? (c) Compare this to the force exerted on the gun if the bullet is accelerated to its velocity in 10.0 ms (milliseconds).
Question by OpenStax is licensed under CC BY 4.0.
Final Answer
  1. $12.0 \textrm{ m/s}$
  2. $-360\textrm{ N}$
  3. The plunger reduces the recoil force by 70%
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OpenStax College Physics Solution, Chapter 8, Problem 14 (Problems & Exercises) (4:46)

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