Physics 011
MC#7A
Chapter
7 : Linear Momentum
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1. |
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How fast
must a 2000-kg body travel in order to have the same momentum as a 200-g body
traveling at 200 m/s? |
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2. |
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A
target rifle is held horizontally at rest and fired. The bullet with mass mo
leaves the barrel of the gun with speed vo, linear momentum of
magnitude po and kinetic energy KEo. The gun has mass Mo
(>>mo). The recoil
speed of the rifle is ___ vo. See Section 7-2 |
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3. |
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A
target rifle is held horizontally at rest and fired. The bullet with mass mo
leaves the barrel of the gun with speed vo, linear momentum of
magnitude po and kinetic energy KEo. The gun has mass Mo
(>>mo). The
magnitude of the linear momentum of the recoiling rifle is ___ po. See Section 7-2 |
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4. |
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A
target rifle is held horizontally at rest and fired. The bullet with mass mo
leaves the barrel of the gun with speed vo, linear momentum of
magnitude po and kinetic energy KEo. The gun has mass Mo
(>>mo). The
kinetic energy of the recoiling rifle is ___ KEo. |
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5. |
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A
target rifle is held horizontally at rest and fired. The bullet with mass mo
leaves the barrel of the gun with speed vo, linear momentum of
magnitude po and kinetic energy KEo. The gun has mass Mo
(>>mo). If the
mass of the bullet had been slightly smaller, the magnitude of the sum of the
linear momentum of the bullet and the linear momentum of the gun would have
been ___. See Section 7-2 |
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6. |
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A rifle
with a mass of 0.20 kg fires a 0.50-gram bullet with an initial velocity of
100 m/s. What is the recoil velocity of the rifle? |
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7. |
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A 0.2-kg
ball is bounced against a wall. It hits the wall with a speed of 20 m/s and
rebounds elastically. What is the magnitude of the change in momentum of the
ball? See Sections 7-1, 3-3 |
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8. |
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A 30-kg
cart traveling due north at 5 m/s collides with a 50-kg cart that had been
traveling due south. Both carts immediately come to rest after the collision.
What must have been the speed of the southbound cart? |
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9. |
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A
red object with mass 3 mo moves with a speed of 3 vo
toward the north. A blue object with mass 2 mo moves with speed 6vo
toward the south. A perfectly inelastic collision occurs in which the two
objects stick together and move as one object after the collision. The total
kinetic energy of the two objects just after the collision is ___ the total
kinetic energy of the two objects just before the collision. See Section 7-6 |
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10. |
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A
red object with mass 3 mo moves with a speed of 3 vo
toward the north. A blue object with mass 2 mo moves with speed 6vo
toward the south. A perfectly inelastic collision occurs in which the two
objects stick together and move as one object after the collision. The
magnitude of the sum of the linear momentum of the two objects just after the
collision is ___ the magnitude of the sum of the linear momentum of the two
objects just before the collision. See Section 7-2 |
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11. |
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A
red object with mass 3 mo moves with a speed of 3 vo
toward the north. A blue object with mass 2 mo moves with speed 6vo
toward the south. A perfectly inelastic collision occurs in which the two
objects stick together and move as one object after the collision. The
magnitude of the total linear momentum of the two objects just before the
collision is movo x ___. See Section 7-2 |
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12. |
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A
red object with mass 3 mo moves with a speed of 3 vo
toward the north. A blue object with mass 2 mo moves with speed 6vo
toward the south. A perfectly inelastic collision occurs in which the two
objects stick together and move as one object after the collision. If the
speed of the red object had been slightly more, the magnitude of the total
linear momentum of the two objects would have been ___. |
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13. |
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A
red object with mass 3 mo moves with a speed of 3 vo
toward the north. A blue object with mass 2 mo moves with speed 6vo
toward the south. A perfectly inelastic collision occurs in which the two
objects stick together and move as one object after the collision. Immediately
after the collision, the two objects will ___. See Section 7-2 |
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14. |
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A car with
a mass of 800 kg is stalled on a road. A truck with a mass of 1200 kg comes
around the curve at 20 m/s and hits the car. The two vehicles remain locked
together after the collision. What is their speed after the impact? See Section 7-6 |
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15. |
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A 1000 kg
car traveling at 5.0 m/s overtakes and collides with a 3000 kg truck
travelling in the same direction at 1.0 m/s. During the collision the two vehicles
couple together and continue to move as one unit. What is the speed of the
coupled vehicles? See Section 7-6 |
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16. |
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A tennis
ball is hit with a tennis racket and the change in the momentum of the ball
is 4 kg m/s. If the collision time of the ball and racket is 0.01 seconds,
what is the magnitude of the force exerted by the ball on the racket? |
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17. |
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A
160-pound jogger runs at a constant speed. What is his momentum if he covers
100 yards in 10 seconds? See Section 7-1 |
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18. |
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A
spacecraft with a total mass of 10,000 kg lifts off from the Kennedy Space
Center in Florida. Its rockets burn for 15 seconds and produce a thrust of
3.0 x 105 N. Assuming that the net mass of the spaceship does not
change as the rocket fuel is consumed, what is the final velocity of the
spaceship? See Section 7-3 |
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19. |
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In a
combustion engine, gas is burned. The resulting explosion produces a force that
drives the pistons in the engine. The force of the explosion on the piston is
due to the change in momentum of the gas molecules. A 0.4-g sample of gas
produces a force of 2400 N in an explosion that lasts 10-3
seconds. What must be the speed of the gas molecules? See Section 7-3 |
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20. |
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A
bomb of mass 4 mo initially at rest explodes into two pieces. One
piece with a mass 3 mo moves toward the east with speed vo
and kinetic energy KEo. The speed
of the second bomb fragment will be vo x ___. See Section 7-2 |
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21. |
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A
bomb of mass 4 mo initially at rest explodes into two pieces. One
piece with a mass 3 mo moves toward the east with speed vo
and kinetic energy KEo. The
kinetic energy of the second bomb fragment is ___ KEo. See Sections 7-2, 6-3 |
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22. |
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A second
bomb with more powder than the first one also initially at rest explodes into
two pieces. The masses of these two pieces are the same as for the first bomb.
The magnitude of the total linear momentum of the two bomb fragments for this
second bomb is ___ the magnitude of the total linear momentum of the bomb
fragments in the first explosion. See Section 7-2 |