CHAPTER 6 (PHYSICS)

A ball is moving at 3 m/s and has a momentum of 48 kg m/s. What is the balls mass?

16 kg

A 5000 kg freight car moving at 2 m/s runs into a 10000 kg freight car at rest, they couple upon collision and move away as one body at

2/3 m/s

A 1000 kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is

2000 N

A 4kg ball has a momentum of 12 kg m/s. What is the balls speed?

3 m/s

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

5/6 m/s

Which of the following has the largest momentum relative to the Earths surface?

A pickup truck speeding along a highway

A freight train rolls along a truck with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is

Doubled

When a cannonball is fired from a cannon, the momentum of the recoiling cannon is momentarily

Equal and opposite to the momentum of the fired cannonball

The force that accelerates a rocket in outer space is exerted on the rocket by the

Exhaust gases

A boxer rides with the punch so as to reduce

Force

Follow through is important in golf because it results in a greater

Impulse on the ball

Padded dashboards in cars are safer in an accident than non padded ones because a occupant hitting the dash has

Increased time of impact

When you are in the way of a fast moving object and cant get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a

Long time

Two objects have the same size and shape but one is much heavier than the other. When they are dropped simultaneously from a tower, they reach the ground at the same time, but the heavier one has a greater

Momentum

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

A sandbag is motionless in outer space. A second sandbag with 3 times the mass moving at 12 m/s collides with it. They stick together and move and at a speed of

None of these

A 1-N apple falls to the ground. The apple hits the ground with an impact force of about

Not enough information

When a big fish swims into an oncoming smaller fish and swallows it, the momentum of the two fish system

Remains the same

A rifle recoils while firing a bullet. The speed of the rifles recoil is small because the

Rifle has much more mass than the bullet

It is correct to say that impulse is equal to

The change in momentum it produces

Suppose that a tiny gun made of a strong but very light material fires a bullet that is more massive than the gun itself. For such a weapon

The target would be safer than the shooter

When a falling firecracker explodes, the momenta of its pieces

Vectorally add to equal the initial momentum of the firecracker

When two vehicles collide, momentum is conserved

Whether the collision is elastic or inelastic

Two billiard balls having the same mass and speed roll towards each other. What is their combined momentum after they meet?

Zero