Physics Final Exam

1 kg

A 1-kg rock is suspended from the tip of a meter stick at the 0- cm mark so that the meter stick balances like a see-saw when the fulcrum is at the 25-cm mark. From this information, what is the mass of the meter stick?

10 times as much

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is

1

A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block in meters per second per second is

3 m/s

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

always have forces that oppose their motion.

According to Newton's law of inertia, a railroad train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains

random motions of atoms and molecules.

Brownian motion has to do with the

acceleration

Disregarding air resistance, objects fall with constant

is exactly equal in magnitude.

For an action force, there must be a reaction force that

mouse

Which has more skin compared to its body weight, an elephant or a mouse?

Both have the same density.

Which has the greater density, a lake full of water or a cup full of lake water?

the gravitational attraction force between you and the Earth.

your weight is

5/6 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

1/6 m/s

A 5 kg shark swimming at a speed of 1 m/s swallows an absent-minded 1 kg fish swimming toward it at 4 m/s. The speed of the shark after this meal is

the same

A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about

the bottom

A ball rolling down an incline has its maximum kinetic energy at

1000N

A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is

40 J

A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy that is

is 9.8

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

the same for both.

A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is

magnitude and direction

A force is a vector quantity because it has both

greater

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 to the force that stops the car, the force needed to stop the truck is

non-zero, directed toward the spaceship.

A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is zero. When a very massive space ship lands on the planet's surface, inhabitants find that the gravitational field inside the planet is

power

A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of

3000N

A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is

400N

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

at the beginning of the record

A phonograph record player has constant rotational speed. The speed of the record surface relative to the pickup needle is greatest

400N

A piece of rope is pulled by two people in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope?

force the glove exerts on the ball.

A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the

force that the ball exerts on the bat.

A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the

rifle has much more mass than the bullet.

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

equal to its weight.

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is

none of these

A skydiver falls towards the Earth. The attraction of the Earth on the diver pulls the diver down. What is the reaction to this force?

another 10 cm, making the total stretch 20 cm.

A strong spring is stretched 10 cm by a suspended weight. If the weight is doubled, the spring will stretch

4 m

A swimming area in a rotating space habitat is located in a g region. If a diver can jump 1 m high in a 1 g region, how high can the same diver jump in the swimming area?

Both forces are the same.

A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater?

500 kg per cubic meter

A wooden block has a mass of 1000 kg and a volume of 2 cubic meters. What is the block's density?

the same as its potential energy.

After rolling halfway down an incline a marble's kinetic energy is

10m/s

An apple falls from a tree and hits the ground 5 meters below. It hits the ground with a speed of about

0 N

An apple weighs 1 N. When held at rest above your head, the net force on the apple is

40 N

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a point 3 times as far from the center of the asteroid, the force will be

a carbon atom

An atomic mass unit (amu) is 1/12 the mass of

potential energy

An object at rest may also have

all of these

An object in mechanical equilibrium is an object

twice as much

An object is propelled along a straight-line path by a force. If the net force were doubled, the object's acceleration would be

twice as much

An object lifted 10 meters gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain is

location

An object may have potential energy because of its

moving

An object that has kinetic energy must be

both the same, interestingly enough.

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by

pull of the ball's mass on the Earth.

As a ball falls, the action force is the pull of Earth on the ball. The reaction force is the

60m/s

At one instant an object in free fall is moving downward at 50 meters per second. One second later its speed should be about

the same

Compared to a bar of pure gold, the density of a pure gold ring is

feels heavier when you throw it in the direction of the moving alley, and lighter when you throw it in the opposite direction.

Consider a bowling alley inside a rotating space torus (huge "donut"). Compared to your bowling experience on earth, you will notice that the ball

twice as fast

Consider a string with several rocks tied along its length at equally spaced intervals. You whirl the string overhead so that the rocks follow circular paths. Compared to a rock in the middle of the string, a rock at the outer end moves

mass of the building attracts us upward slightly.

Each of us weighs a tiny bit less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper. The reason for this is the

time rates

Galileo's interpretation of motion differed from Aristotle's in that Galileo emphasized

slow down the acceleration of free fall.

Galileo's use of inclined planes allowed him to effectively

one half

Half way to the center of a planet of uniform density, your weight compared to at the surface would be

add up to equal your weight.

Hang from a pair of gym rings and the upward support forces of the rings will always

1000

If a pencil's length and diameter are both multiplied by 10, then its volume is multiplied by

more than the golf ball

If a ping pong ball and a golf ball are both moving in the same direction with the same amount of kinetic energy, the speed of the ping pong ball must be

the astronaut and an equal amount of the planet would both annihilate.

If an astronaut landed on a planet made of antimatter, there would be an explosion and

greater than the second before.

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

continue moving at the same velocity.

If no external forces are acting on a moving object, it will

lower

If the moon were four times as massive but twice as far from Earth, high tides on Earth would be

increase

If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would

three times the usual power output.

If you do work on an object in one-third the usual time, your power output is

decrease

If you replace the wheels and tires of your car with new ones having greater diameters, all of your speedometer readings thereafter will

quadruple

If your mass, the mass of the Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth would

orbital electrons

In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of

time of impact is increased.

In order to catch a ball, a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball's motion. Doing this reduces the force of impact on the player's hand principally because the

apparent weight for you

Inside a freely-falling elevator, there would be no

ancient stars

Nuclei of atoms that make up a newborn baby were made in

increased time of impact.

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

none of the above

Starting from rest, the distance a freely-falling object will fall in 0.5 second is about

gravitation

The central concept underlying the theory of the oscillating universe is

electrons

The chemical properties of matter come mostly from its

10N

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

zero

The force required to maintain an object at a constant velocity in free space is equal to

moon has a sufficient tangential speed.

The reason the moon does not crash into the Earth is that the

straight

The rotational inertia of your leg is greater when your leg is

Galileo

The scientist to first introduce the concept of inertia was

thickness

The strength of a rope depends on its

distance and time

The two measurements necessary for calculating average speed are

south

To weigh less in the northern hemisphere, you should move to a location further

0

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

size and speed of the object.

Two factors that greatly affect air resistance on falling objects are the

momentum

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

heavier object

Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the

tension

When a load is placed on the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes

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

When a rock thrown straight upwards gets to the exact top of its path, its

given off by the reaction

When carbon and oxygen atoms combine, energy is

compression

When weight is applied to the top of a stone arch, all of the stone blocks in the arch undergo

add up to equal your weight.

When you stand at rest on a pair of bathroom scales, the readings on the scales will always

a sliced potato.

Which cooks faster in boiling oil?

neutron

Which of the following are electrically neutral?

There are only about 100 different kinds of atoms that combine to form all substances.

Which of the following statements is true?

uranium

Which of these atoms has the most mass?

water

Which will roll down an incline in the shortest time, a can filled with water or the same can filled with ice?

none of the above

While a car travels around a circular track at a constant speed its

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?