chapter 6

If a monkey floating in outer space throws his hat away, the hat and the monkey will both

move away from each other, but at different speeds

The conservation of momentum is most closely related to

newtons third law

The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is

16 kg

A 5000-kg freight car moving at 2 m/s collides with a 10,000-kg freight car at rest. They couple upon collision and move away at

2/3 m/s

The speed of a 4-kg ball with a momentum of 12 kg m/s is

3 m/s

A 5-kg fish swimming at 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is

5/6 m/s

A 5000-kg freight car collides with a 10,000-kg freight car at rest. They couple upon collision and move at 2 m/s. What was the initial speed of the 5000-kg car?

6 m/s

The impulse-momentum relationship is a direct result of

Newtons 2nd law

It is correct to say that impulse is equal to

a corresponding change in momentum

Wether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is greater for what

both the same

You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum during the time of contact?

both the same

A Cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the

cannon has much more mass than the cannonball

When bullets are fired from an airplane in the forward direction, the momentum of the airplane is

decreased

The total momentum of a flock of identical birds could be zero only if the birds are

flying in different directions

A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is greater smaller or the same

greater

When a boxer moves into an oncoming punch, the force experienced is

increased

Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting the dashboard encounter

lengthened time of contact

A large heavy truck and a small baby carriage roll down a hill. neglecting friction at the bottom of the hill, the baby carriage will have, more or less or the same momentum?

less momentum

To catch a fast moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because

stopping time is increased

a karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force is , more less or

the same as the force applied to the block

The force on a dropped apple hitting the ground depends upon

the speed of the apple before impact, wether or not it bounces, time of contact