Exam 1 ch:1-7

two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet? twice the sum of their original momentum 0 half the sum of their original momentums impossible to determine without additional information

0

A rifle of mass 2 kg is suspended by strings. The rifle fires a bullet of mass 0.01 kg at a speed of 200 m/s. The recoil velocity of the rifle is about A) 0.001 m/s. B) 0.01 m/s. C) 0.1 m/s. D) 1 m/s. E) none of these

1 m/s

a rifle of mass 2kg is suspended by strings. the rifle fires a bullet of mass 0.01 kg at a speed of 200m/s. the recoil velocity of the rifle is about 1m/s 0.01 m/s 0.1m/s 0.001m/s none of these

1 m/s

If a projectile is fired straight up at a speed of 10m/s, the total time to return to its starting position is about 10 seconds 1 seconds 2 seconds 20 seconds Not enough information

10 seconds

The force of friction on a sliding is 10 N. The applied force needed to maintain a constant velocity is Less than 10N More than 10N 10N

10N

a car moves 4 times as fast as another identical car. compared to the slower car, the faster car has 8 times the KE 4 times the KE 16 times the KE 12 times the KE

16 times the KE

a 5000kg freight car runs into a 10,000 kg freight car at rest. they couple upon collision and move with a speed of 2 m/s. what was the initial speed of the 5000kg car? 6m/s 5m/s 8m/s 4m/s none of these

4m/s

a diver who weighs 500 N steps off a diving board that is 10m above water. the diver hits the water with kinetic energy of 5000 J 10 J 510 J 500 J more than 5000 J

5000 J

If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is 600 km/h/s 6 km/h/s 60 km/h/s 3 km/h/s 10 km/h/s

6 km/h/s

At one instant an object in free fall is moving downward at 50 meter per second one second later it's speed should be about 55m/s 60m/s 100m/s 50m/s 25m/s

60m/s

A 500 kg freight car runs into a 10,000 kg freight car at rest. They couple upon collision and move with a speed of 2m/s. What was the initial speed of the 5000 kg car 6m/s 5m/s 8m/s 4m/s None of these

6m/s

It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is that About 180m More than 200m About 60m About 120m

About 180m

Disregarding air resistance, objects fall with constant Acceleration Velocity Distances each successive second Speed

Acceleration

Hang from a pair of gym rings and the upward support forces of the rings will always Each be half your weight Each equal your weight Add up to equal your weight

Add up to equal your weight

If no external forces are acting on a moving object, it will Continue moving at the same velocity Continue moving at the same speed Move slower and slower until it finally stops

Continue moving at the same velocity

A truck is moving at a constant velocity. Inside the storage compartment, a rock is rock is dropped fro, the midpoint of the ceiling and strikes the floor below. The rock hits the floor Ahead of the midpoint of the ceiling Behind the midpoint Exactly below the midpoint More information needed None of these

Exactly below the midpoint

It is correct to say that impulse is equal to Velocity multiplied by time The force multiplied by the distance the force acts The change in momentum it process Momentum

The change in momentum it process

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The reason this can be done is that The milk carton has no acceleration The milk carton has inertia Gravity tends to hold the milk carton secure There is an action reaction pair of forces None of these

The milk carton has inertia

two billard balls having the same mass and speed roll toward each other. what is their combined momentum after they meet Twice the sum of their original momentum 0 Half the sum of their original momentums Impossible to determine without additional information

Twice the sum of their original momentum

It takes 6 seconds for a stone to fall to the bottom of a mine shaft. how deep is the shaft? about 180m more than 200m about 60m about 120m

about 180m

if an object is raised twice as high, its potential energy will be twice as much four times as much half as much impossible to determine unless the time is given

four times as much

when you are in the way of a fast moving object and can get out of its way, you will suffer a smaller force of impact if you deserve its momentum over a short time long time same way either way

long time

No work is done by gravity on a bowling ball that rolls along a bowling alley because no force acts on the ball the force on the ball is at right angles to the balls motion no potential energy is being converted to kinetic energy no distance is covered by the ball its kinetic energy remains constant

no potential energy is being converted to kinetic energy

It is correct to say that impulse is equal to velocity multiplied by time the force multiplied by the distance the force acts the change in momentum it produces momentum

the change in momentum

If you push an object a given distance, while applying twice the force, you do twice as much work half as much work four times as much work the same amount of work

twice as much work