Physics 101 Midterm Exam Review

Which has the greatest number of protons in its nucleus?

lead

A pair of tennis balls fall through the air from a tall building. One of them is filled with lead pellets. The ball to reach the ground first is the

lead-filled ball.

Scientists repeat experimental findings in order to

neither A nor B

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

none of the above

Of the sciences known as physics, chemistry, and biology, the most basic is

physics

The weight of matter comes mostly from its

protons

Brownian motion has to do with the

random motions of atoms and molecules.

A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its path is about

10 N.

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

1000 N.

An object released from rest on another planet requires one second to fall a distance of 6 meters. What is the acceleration in meters per second per second due to gravity on this planet?

12

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car?

1500 kg

How many protons should be added to the nuclei of oxygen atoms so the resulting gas will glow red when there is an electric current through it?

2

A 10.0 N force is pulling up on the ring of spring scale that weighs 2.0 N. If an 8.0 N mass is attached to the bottom hook of the scale, the scale reading would be

2.0 N.

An object, at rest near the surface of a distant planet, starts to fall freely . If the acceleration there is twice that of the earth, its speed one second later would be

20 m/s.

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?

2000 N

What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?

2400 N

If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be

3000 m/s.

An astronaut on another planet drops a 1-kg rock from rest. The astronaut notices that the rock falls 2 meters straight down in one second. On this planet, how much does the rock weigh?

4 N

Two people, one twice as massive as the other, attempt a tug-of- war with 12 meters of massless rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of

4 m.

A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. Neglecting air resistance, one second later the rock's speed is

4.9 m/s.

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.

An object is pulled northward by a force of 10 N and at the same time another force of 15N pulls it southward. The magnitude of the resultant force on the object is

5 N.

One half second after starting from rest, a freely-falling object will have a speed of about

5 m/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

60 m/s.

If you drop an object, it will accelerate downward at a rate of 9.8 meters per second per second. If you instead throw it downwards, its acceleration (in the absence of air resistance) will be

9.8 meters per second per second.

If a gram of antimatter meets a kilogram of matter, the amount of mass to survive is

999 grams.

During the time of the year when the Earth starts moving closer to the sun, the sun

does not move at all in response to the Earth's approach.

The chemical properties of matter come mostly from its

electrons

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

force that the ball exerts on the bat.

A large and a small person wish to parachute at equal terminal velocities. The larger person will have to

get a larger parachute.

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

greater than the second before.

An object following a straight-line path at constant speed

has zero acceleration.

A skydiver's terminal velocity will be greatest if she falls

head first.

In science, an educated guess is a

hypothesis

In science, an educated guess is called a

hypothesis

A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension

increases.

In each second of fall, the distance a freely falling object will fall is

increasing.

Most natural phenomena we wonder about

involve several scientific disciplines.

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 9.8.

Galileo's use of inclined planes allowed him to effective

slow down the acceleration of free fall.

The statement, "There are regions beneath Earth's crust that will always be beyond the reach of scientific investigation," is a

speculation

A factor that usually determines whether a substance is in the solid, liquid, gaseous, or plasma state is its

temperature

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

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

Your weight is

the gravitational attraction force between you and the Earth.

A rocket becomes progressively easier to accelerate as it travels upward from the ground mainly because

the mass of the rocket decreases as fuel is burned.

The attraction of a person's body toward the Earth is called weight. The reaction to this force is

the person's body pulling on the Earth.

Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are

the same age.

Drop a rock from a 5-m height and it accelerates at 10 m/s2 and strikes the ground 1 s later. Drop the same rock from a height of 2.5 m and its acceleration of fall is about

the same amount.

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

the same for both.

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 same.

Compared to the energy it takes to separate oxygen and hydrogen from water, the amount of energy given off when they recombine is

the same.

There are about as many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of

the whole world.

How many different elements are in a water molecule?

two

When a falling object has reached its terminal velocity, its acceleration is

zero.

The smallest particle of those listed below is

a quark.

The mass of a pet turtle that weighs 10 N is

about 1 kg.

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.

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 50 m/s

If an object of constant mass experiences a constant net force, it will have a constant

acceleration.

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

add up to equal your weight.

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair - no wall, no tricks. You

agree that it can't be done.

A truly educated person is knowledgeable about

all of the above

The air in this room has

all of these

Which has zero acceleration? An object

all of these

Science, art, and religion do not contradict one another because

all three have different domains.

The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance of

(100 - 4.9) m.

Which has the greater mass?

an automobile battery

A positron orbiting an antiproton would make up an atom of

anti-hydrogen.

An object maintains a constant acceleration unless there is a change in

any of the above

If two protons are removed from an oxygen nucleus, the result is

carbon

Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction from the first force. The particle with both forces acting on it

continues at the speed it had when it encountered the second force.

A skydiver steps from a helicopter and falls for a few seconds until he reaches his terminal velocity. Thereafter, until he opens his parachute, his acceleration

decreases.

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

0 N.

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

1.