Ch9test_CollisionandMomentum

Ch9test_CollisionandMomentum - 1 A 2000-kg truck traveling...

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Linear Momentum and Collisions 1 1. A 2000-kg truck traveling at a speed of 6.0 m/s makes a 90 ° turn in a time of 4.0 s and emerges from this turn with a speed of 4.0 m/s. What is the magnitude of the average resultant force on the truck during this turn? a. 4.0 kN b.5.0 kN c.3.6 kN d.6.4 kN e.0.67 kN 2. A 1.2-kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction. If the object is in contact with the wall for 2.0 ms, what is the magnitude of the average force on the object by the wall? a. 9.8 kN b.8.4 kN c.7.7 kN d.9.1 kN e.1.2 kN 3. A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30 ° below the horizontal just before it strikes a horizontal surface. The ball leaves this surface 0.50 s later with a velocity of 2.0 m/s directed 60 ° above the horizontal. What is the magnitude of the average resultant force on the ball? a. 14 N b.11 N c.18 N d.22 N e.3.0 N 4. The only force acting on a 2.0-kg object moving along the x axis is shown. If the velocity v x is –2.0 m/s at t = 0, what is the velocity at t = 4.0 s? a. –2.0 m/s b. –4.0 m/s c. –3.0 m/s d. +1.0 m/s e. +5.0 m/s 5. The only force acting on a 2.0-kg object moving along the x axis is shown. If the velocity v x is +2.0 m/s at t = 0, what is the velocity at t = 4.0 s? 6. The speed of a 2.0-kg object changes from 30 m/s to 40 m/s during a 5.0-s time interval. During this same time interval, the velocity of the object changes its direction by 90 ° . What is the magnitude of the average total force acting on the object during this time interval? a. 30 N b.20 N c.40 N d.50 N e.6.0 N 7. A 3.0-kg ball with an initial velocity of (4i + 3j) m/s collides with a wall and rebounds with a velocity of (–4i + 3j) m/s. What is the impulse exerted on the ball by the wall? 8. A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/ s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor? a. 9.6 N s b.2.4 N s c.6.4 N s d.1.6 N s e.1.0 N s 9. A 0.16-kg baseball is thrown with a speed of 40 m/s. It is hit straight back at the pitcher with a speed of 80 m/s. What is the magnitude of the impulse exerted on the ball by the bat? a. 16 N s b.6.4 N s c.19 N s d.3.2 N s e.64 N s 10. An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision? a. 32 J b.52 J c.41 J d.25 J e.29 J 11. A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just after the collision?
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