Physics Test 1

If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about 2 seconds. 1 second. 10 seconds. not enough information to estimate

1 second.

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is more than 10 N. less than 10 N. 10 N.

10 N.

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about 5 m/s. 10 m/s. 15 m/s. a variable amount. depends on its initial speed

10 m/s.

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is one-tenth as much. zero. the same as the force on the 1-kg book. 10 times as much.

10 times as much.

A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is more than 1000 N. 1000 N. less than 1000 N. impossible to determine.

1000 N.

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 6/5 m/s. 5/6 m/s. 1/2 m/s. 2/5 m/s. 1 m/s.

5/6 m/s

A 10-kilogram block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and comes to rest. It takes the block 2 seconds to stop. The stopping force acting on the block is about 25 N. 50 N. 10 N. 5 N. none of these

50 N.

A person is attracted toward the center of Earth by a 500-N gravitational force. The Earth is attracted toward the person with a force of 1000 N. 500 N. 250 N. zero.

500 N.

In science, a theory is a synthesis of a large body of well-tested knowledge. an educated guess. unchangeable. less than a fact.

a synthesis of a large body of well-tested knowledge

The force exerted on the tires of a car to directly accelerate it along a road is exerted by the tires. road. engine. air. none of these

road.

You and your car travel at a constant velocity of 20 m/s north for 10 s. The car's acceleration during these 10 seconds is: 20 m/s2 2 m/s2 200 m/s2 0 m/s2

0 m/s2

A car accelerates at 2 meters per second per second. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s? 2 seconds 15 seconds 60 seconds 30 seconds none of these

15 seconds

A ball is moving at 3 m/s and has a momentum of 48 kg m/s. What is the ball's mass? A ball is moving at 3 m/s and has a momentum of 48 kg m/s. What is the ball's mass? 16 kg 12 kg 4 kg 144 kg none of these

16 kg

Using dimensional analysis, convert 40 weeks into seconds 2.42x10^7 s 4.03x10^5 s 2.42x10^6 s 4.03x10^4 s

2.42x10^7 s

A horse gallops a distance of 10 kilometers in a time of 30 minutes. Its average speed is 30 km/h. 20 km/h. 40 km/h. 15 km/h.

20 km/h.

A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What is the magnitude of the net force exerted on the car? 1500 N 2000 N 500 N 1000 N none of these

2000 N

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is 2000 N. 3000 N. 5000 N. 4000 N. 1000 N.

2000k

A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? 48 m/s 3 m/s 12 m/s 4 m/s none of these

3 m/s

A girl pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration in meters per second per second? 0.3 300 3.0 10 30

3.0

Using dimensional analysis, convert 10,560 feet into cm 4.99x10^4 cm 3.22x10^6 cm 4.99x10^5 cm 3.22x10^5 cm

3.22x10^5 cm

Express 4,650,000 in scientific notation: 4.65x10^-6 4.65x10^-5 4.65x10^6 4.65x10^5

4.65x10^6

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is 400 N. 200 N. 800 N. none of these

400 N.

One half second after starting from rest, a freely falling object will have a speed of about 20 m/s. 5 m/s. 2.5 m/s. 10 m/s. none of these

5 m/s.

If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about 3 m/s. 6 m/s. 4 m/s. 2 m/s.

6 m/s.

Express .000069 in scientific notation 6.9x10^-5 6.9x10^-4 6.9x10^-3 6.9x10^-2

6.9x10^-5

Science is a body of knowledge that is an ongoing activity of humans. describes order in nature. condenses knowledge into testable laws. All of the above choices are correct. None of the above choices are correct.

All of the above choices are correct.

A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the Mack truck. Volkswagen. same for both.

Volkswagen.

When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. In this way the average force your body experiences is more than 1/10 as great. less than 1/10 as great. about 1/10 as great. about 10 times as great.

about 1/10 as great

A ball is thrown 125 meters upward and then falls the same distance back to Earth. Neglecting air resistance, its total time in the air is about 10 seconds. more than 20 seconds. about 15 seconds. about 5 seconds.

about 10 seconds.

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

about 180 m

A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds? about 80 m/s about 60 m/s about 50 m/s about 100 m/s about 110 m/s

about 50 m/s

Science, art, and religion do not contradict one another because all three have different domains. if you choose the right one, you can forget the other two. if you choose science, you can forget about religion and art. if you choose religion and art, you can forget about science.

all three have different domains.

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

continue moving at the same velocity.

The two measurements necessary for calculating average speed are velocity and time. distance and acceleration. velocity and distance. acceleration and time. distance and time.

distance and time.

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

doubled

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to follow a straight-line path. revolve in a smaller circle. increase its speed. continue to follow a circular path.

follow a straight-line path.

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be doubled. greater than the second before. constant. less and less each second.

greater than the second before.

A bullet is fired from a gun. The speed of the bullet will be about the same as the speed of the recoiling gun because velocity is conserved. because momentum is conserved. because both velocity and momentum are conserved. if the mass of the bullet equals the mass of the gun. none of these

if the mass of the bullet equals the mass of the gun.

If your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is gravity. acceleration. inertia. resistance.

inertia.

A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in meters per second per second is more than 9.8. is 9.8. depends on the height of the cliff. is less than 9.8.

is 9.8.

A kilogram is a measure of an object's force. size. weight. mass.

mass

An astronaut , floating alone in outer space, throws a baseball. If the ball floats away at a speed of 20 meters per second, the astronaut will move in the opposite direction at a speed of 20 m/s. move in the opposite direction but at a higher speed. move in the opposite direction, but at a lower speed. not move as stated in any of the above choices.

move in the opposite direction, but at a lower speed.

A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the momentum is mainly concentrated in the bullet. rifle has much more mass than the bullet. momentum of the rifle is smaller. force against the rifle is smaller than against the bullet.

rifle has much more mass than the bullet.

Compared to falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the carpet provides a smaller impulse and a longer time. carpeted floor provides a smaller impulse. stopping time is shorter on the carpet. stopping time is longer on the carpet.

stopping time is longer on the carpet.

Which of the following is a scientific statement? The moon is made of green cheese. Matter is filled with undetectable particles. There are parts of the universe that will never be found by man. There are things we will never know about. none of these

the moon is made of green cheese

A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the two rocks has the greater mass? They have the same mass. the one on the moon the one on Earth not enough information to say

the one on the moon

A automobile and a baby carriage traveling at the same speed collide head-on. The impact force is greater on the automobile. greater on the baby carriage. the same for both.

the same for both.

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is six times as much. one sixth as much. the same. zero.

the same.

When a rock thrown straight upwards gets to the exact top of its path, its velocity is about 10 m/s and its acceleration is about 10 meters per second per second. velocity is zero and its acceleration is zero. velocity is zero and its acceleration is about 10 meters per second per second. velocity is about 10 m/s and its acceleration is zero. none of these

velocity is zero and its acceleration is about 10 meters per second per second.

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is 1000 km/hr. 110 km/hr. 10 km/hr. zero.

zero.