FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 6: Momentum and Collisions

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 41

Multiple Choice

Review LaterAdd Note

Review Later

A billiard ball collides in an elastic head-on collision with a second identical ball.What is the kinetic energy of the system after the collision compared to that before collision?

A) the same as
B) one fourth
C) twice
D) four times

E) C) and D)
F) None of the above

Correct Answer

verified

Show Answer

Question 42

Multiple Choice

Review LaterAdd Note

Review Later

A model car is propelled by a cylinder of carbon dioxide gas.The cylinder emits gas at a rate of 4.5 g/s with an exit speed of 80.0 m/s.The car has a mass of 400 g,including the CO₂ cylinder.Starting from rest,what is the car's initial acceleration?

A) 0.90 m/s²
B) 4.5 m/s²
C) 9.0 m/s²
D) 36 m/s²

E) B) and D)
F) B) and C)

Correct Answer

verified

Show Answer

Question 43

Multiple Choice

Review LaterAdd Note

The dimensional equivalent of the quantity impulse in terms of the fundamental quantities (mass,length,time) is which of the following?

Two billiard balls have velocities of 2.0 m/s and -1.0 m/s when they meet in an elastic head-on collision.What is the final velocity of the first ball after collision?

Alex throws a 0.15-kg rubber ball down onto the floor.The ball's speed just before impact is 6.5 m/s,and just after is 3.5 m/s.What is the change in the magnitude of the ball's momentum?

When a collision is perfectly inelastic,then:

A 5.00-g bullet is fired into a 900-g block of wood suspended as a ballistic pendulum.The combined mass swings up to a height of 8.00 cm.What was the kinetic energy of the bullet immediately before the collision?

A 2 500-kg truck moving at 10.00 m/s strikes a car waiting at a traffic light,hooking bumpers.The two continue to move together at 7.00 m/s.What was the mass of the struck car?

A 1 000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant.It exhausts the propellant in a 20-s "burn." The rocket moves at 150 m/s after the burn.What average force is experienced by the rocket during the burn?

A helicopter stays aloft by pushing large quantities of air downward every second.What mass of air must be pushed downward at 40.0 m/s every second to keep a 1 000-kg helicopter aloft?

A 75-kg swimmer dives horizontally off a 500-kg raft.If the diver's speed immediately after leaving the raft is 4 m/s,what is the corresponding raft speed?

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

A baseball infielder,mass 75.0 kg,jumps up with velocity 3.00 m/s and catches a 0.150-kg baseball moving horizontally at 50.0 m/s.Of the following,which is closest to the final momentum of the system,infielder and baseball?

Two masses m₁ and m₂,with m₁ < m₂,have momenta with equal magnitudes.How do their kinetic energies compare?

If a two-body collision is not head-on,then we may always assume that:

If the momentum of an object is tripled,its kinetic energy will change by what factor?

A 75-kg swimmer dives horizontally off a 500-kg raft.The diver's speed immediately after leaving the raft is 4.0 m/s.A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface.If the time interval is read as 0.20 s,what is the magnitude of the average horizontal force by diver on the raft?

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?

The dimensional equivalence of the quantity "momentum" in terms of the fundamental quantities (mass,length,time) is:

Two objects,one less massive than the other,collide elastically and bounce back after the collision.If the two originally had velocities that were equal in size but opposite in direction,then which one will be moving faster after the collision?