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Exam 6: Momentum and Collisions

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Question 41

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Lonnie pitches a baseball of mass 0.20 kg.The ball arrives at home plate with a speed of 35 m/s and is batted straight back to Lonnie with a return speed of 65 m/s.If the bat is in contact with the ball for 0.055 s,what is the impulse experienced by the ball?

A) 6 N⋅s
B) 20 N⋅s
C) 363.6 N⋅s
D) 7 N⋅s
E) ​13 N⋅s

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Question 42

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Alex throws a 0.10-kg rubber ball down onto the floor.The ball's speed just before impact is 7.5 m/s,and just after is 2.5 m/s.What is the change in the magnitude of the ball's momentum?

A) 0.5 kg⋅m/s
B) 1 kg⋅m/s
C) 0.75 kg⋅m/s
D) 0.25 kg⋅m/s
E) ​10 kg⋅m/s

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Question 43

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In a two-body collision,if the momentum of the system is conserved,then which of the following best describes the kinetic energy after the collision?

Kaitlin uses a bat to hit a thrown baseball.She knocks the ball back in the direction from which it came in a partially inelastic collision.The bat,which is heavier than the baseball,continues to move in the same direction after the hit as Kaitlin "follows through." Is the ball moving faster before or after it was hit?

Ann the Astronaut weighs 60 kg.She is space walking outside the space shuttle and pushes a 350-kg satellite away from the shuttle at 0.70 m/s.What speed does this give Ann as she moves toward the shuttle?

A moderate force will break an egg.However,an egg dropped on the road usually breaks,while one dropped on the grass usually doesn't break.This is because for the egg dropped on the grass:

The impulse experienced by a body is equivalent to its change in:

The kinetic energy of an object is quadrupled.Its momentum will change by what factor?

A uranium nucleus (mass 238 units) at rest decays into a helium nucleus (mass 4.0 units) and a thorium nucleus (mass 234 units) .If the speed of the helium nucleus is 6.5 × 10⁵ m/s,what is the speed of the thorium nucleus?

A 2,100-kg truck moving at 11.00 m/s strikes a car waiting at a traffic light,hooking bumpers.The two continue to move together at 8.00 m/s.What was the mass of the struck car?

At liftoff,the engines of the Saturn V rocket consumed 12,700 kg/s of fuel and exhausted the combustion products at 2,500 m/s.What was the total upward force (thrust) provided by the engines?

A 22-g bullet moving at 1,200 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s.What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?

Two identical 6-kg bowling balls roll toward each other.The one on the left is moving at +3 m/s while the one on the right is moving at −3 m/s.What is the velocity of each ball after they collide elastically?

A tennis ball is held above and in contact with a basketball,and then both are simultaneously dropped.The tennis ball bounces off the basketball at a fairly high speed.This is because:

A rocket of total mass M and with burnout mass 0.15 M attains a speed of 3,300 m/s after starting from rest in deep space.What is the exhaust velocity of the rocket?

The law of conservation of momentum is applicable to systems made up of objects described by which of the following?

A 7.5-kg bowling ball strikes a 2.0-kg pin.The pin flies forward with a velocity of 4.5 m/s;the ball continues forward at 5.5 m/s.What was the original velocity of the ball?

Two masses collide and stick together.Before the collision one of the masses was at rest.Is there a situation in which the kinetic energy is conserved in such a collision?

A neutron in a nuclear reactor makes an elastic head-on collision with a carbon atom initially at rest.(The mass of the carbon atom is 12 times that of the neutron. ) What fraction of the neutron's kinetic energy is transferred to the carbon atom?

Three satellites are launched into space connected together.Once in deep space,an explosive charge separates the three satellites and they move apart.The satellites each have different masses with m₁ < m₂ < m₃.Which of the following statements is always true?