(a) Before shooting (at rest) PR PB (b) After shooting FIGURE 7-7 Example 7-5. Rifle recoil. Calculate the recoil velocity of a 5.0-kg rifle that shoots a 0.020-kg-bullet at a speed of 620 m/s. Fig. 7-7. APPROACH Our system is the rifle and the bullet, both at rest initially. just before the trigger is pulled. The trigger is pulled, an explosion occurs inside the bullet's shell, and we look at the rifle and bullet just as the bullet leaves the barrel (Fig. 7-7b). The bullet moves to the right (+x), and the gun recoils to the left During the very short time interval of the explosion, we can assume the external forces are small compared to the forces exerted by the exploding gunpowder. Thus we can apply conservation of momentum, at least approximately. 1

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Chapter9: Linear Momentum And Collisions
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Problem 9.91AP: A 2.00-g particle moving at 8.00 m/s makes a perfectly elastic head-on collision with a resting...
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(a) Before shooting (at rest)
B
PR
PB
(b) After shooting
FIGURE 7-7 Example 7-5.
Rifle recoil. Calculate the recoil velocity of a 5.0-kg rifle that
shoots a 0.020-kg-bullet at a speed of 620 m/s. Fig. 7-7.
APPROACH Our system is the rifle and the bullet, both at rest initially, just
before the trigger is pulled. The trigger is pulled, an explosion occurs inside the
bullet's shell, and we look at the rifle and bullet just as the bullet leaves the barrel
(Fig. 7-7b). The bullet moves to the nght (+x). and the gun recoils to the left
During the very short time interval of the explosion. we can assume the externa
| forces arc small compared to the forces exerted by the cxploding gunpowder.
Thus we can apply conservation of momentum. at least approximately.
Transcribed Image Text:(a) Before shooting (at rest) B PR PB (b) After shooting FIGURE 7-7 Example 7-5. Rifle recoil. Calculate the recoil velocity of a 5.0-kg rifle that shoots a 0.020-kg-bullet at a speed of 620 m/s. Fig. 7-7. APPROACH Our system is the rifle and the bullet, both at rest initially, just before the trigger is pulled. The trigger is pulled, an explosion occurs inside the bullet's shell, and we look at the rifle and bullet just as the bullet leaves the barrel (Fig. 7-7b). The bullet moves to the nght (+x). and the gun recoils to the left During the very short time interval of the explosion. we can assume the externa | forces arc small compared to the forces exerted by the cxploding gunpowder. Thus we can apply conservation of momentum. at least approximately.
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