Question 1

An 800-kg car moving at 80 km/h collides head-on with a 1200-kg car moving at 40 km/h in the opposite direction. If they stick together, the wreckage now has an initial speed of

Accepted Answer

A)  8 km/h. 
B)  40 km/h. 
C)  56 km/h. 
D)  60 km/h. 
A)  8 km/h. 
B)  40 km/h. 
C)  56 km/h. 
D)  60 km/h.

Question 2

In the formula E0 = mc2, the symbol c represents the speed of

Accepted Answer

A)  an object of mass m. 
B)  the observer. 
C)  sound. 
D)  light. 
A)  an object of mass m. 
B)  the observer. 
C)  sound. 
D)  light.

Question 3

The height above the ground of a child on a swing varies from 0.5 m at the lowest point to 2.0 m at the highest point. The maximum speed of the child is

Accepted Answer

A)  about 5.4 m/s. 
B)  about 7.7 m/s. 
C)  about 29.4 m/s. 
D)  dependent on the child's mass. 
A)  about 5.4 m/s. 
B)  about 7.7 m/s. 
C)  about 29.4 m/s. 
D)  dependent on the child's mass.

Question 4

A 90-kg llama has an average power output of 80 W. The minimum time the llama can go up a hill 500 m high is

Accepted Answer

A)  9.4 min. 
B)  46 min. 
C)  1.5 h. 
D)  9.2 h. 
A)  9.4 min. 
B)  46 min. 
C)  1.5 h. 
D)  9.2 h.

Question 5

An object that has linear momentum must also have

Accepted Answer

A)  acceleration. 
B)  angular momentum. 
C)  kinetic energy. 
D)  potential energy. 
A)  acceleration. 
B)  angular momentum. 
C)  kinetic energy. 
D)  potential energy.

Question 6

The sun

Accepted Answer

A)  attracts light waves passing nearby. 
B)  repels light waves passing nearby. 
C)  may attract or repel light waves passing nearby, depending upon the circumstances. 
D)  has no effect on light waves passing nearby. 
A)  attracts light waves passing nearby. 
B)  repels light waves passing nearby. 
C)  may attract or repel light waves passing nearby, depending upon the circumstances. 
D)  has no effect on light waves passing nearby.

Question 7

The linear momentum of a 400-kg giraffe galloping at 5 m/s is

Accepted Answer

A)  80 kgm/s. 
B)  2000 kgm/s. 
C)  5000 kgm/s. 
D)  19,600 kgm/s. 
A)  80 kgm/s. 
B)  2000 kgm/s. 
C)  5000 kgm/s. 
D)  19,600 kgm/s.

Question 8

A 1-kg mass has a KE of 1 J when its speed is

Accepted Answer

A)  0.45 m/s. 
B)  1 m/s. 
C)  1.4 m/s. 
D)  4.4 m/s. 
A)  0.45 m/s. 
B)  1 m/s. 
C)  1.4 m/s. 
D)  4.4 m/s.

Question 9

Rolling a ball up an inclined plank requires an amount of work proportional to the

Accepted Answer

A)  horizontal distance the ball is shifted. 
B)  height the ball is raised. 
C)  sum of the horizontal distance the ball is shifted and the height the ball is raised. 
D)  length of the plank. 
A)  horizontal distance the ball is shifted. 
B)  height the ball is raised. 
C)  sum of the horizontal distance the ball is shifted and the height the ball is raised. 
D)  length of the plank.

Question 10

Which of the following is are) not a unit of power?

Accepted Answer

A)  joule-second 
B)  watt 
C)  Newton-meter/second 
D)  horsepower 
A)  joule-second 
B)  watt 
C)  Newton-meter/second 
D)  horsepower

Question 11

Which of the following quantities is always the same to all observers?

Accepted Answer

A)  time intervals 
B)  the speed of an object 
C)  the speed of sound 
D)  the speed of light 
A)  time intervals 
B)  the speed of an object 
C)  the speed of sound 
D)  the speed of light

Question 12

A 1-N weight has a PE relative to the ground of 1 J when it is at a height of

Accepted Answer

A)  10.2 cm. 
B)  1 m. 
C)  9.8 m. 
D)  98 m. 
A)  10.2 cm. 
B)  1 m. 
C)  9.8 m. 
D)  98 m.

Question 13

A 1-N weight has a KE of 1 J when its speed is

Accepted Answer

A)  0.45 m/s. 
B)  1 m/s. 
C)  1.4 m/s. 
D)  4.4 m/s. 
A)  0.45 m/s. 
B)  1 m/s. 
C)  1.4 m/s. 
D)  4.4 m/s.

Question 14

The 2.5-kg head of an ax exerts a force of 80 kN as it penetrates 18 mm into the truck of a tree. The speed of the ax head when it strikes the tree is

Accepted Answer

A)  1.2 m/s. 
B)  3.4 m/s. 
C)  34 m/s. 
D)  107 m/s. 
A)  1.2 m/s. 
B)  3.4 m/s. 
C)  34 m/s. 
D)  107 m/s.

Question 15

When the speed of an object is doubled,

Accepted Answer

A)  its kinetic energy is doubled. 
B)  its potential energy is doubled. 
C)  its rest energy is doubled. 
D)  its momentum is doubled. 
A)  its kinetic energy is doubled. 
B)  its potential energy is doubled. 
C)  its rest energy is doubled. 
D)  its momentum is doubled.

Question 16

If a spaceship 100 m long when at rest on the earth were to travel at nine-tenths the speed of light, its length as measured by an observer on the earth would be

Accepted Answer

A)  0. 
B)  less than 100 m. 
C)  100 m. 
D)  more than 100 m. 
A)  0. 
B)  less than 100 m. 
C)  100 m. 
D)  more than 100 m.

Question 17

A sedentary person requires about 6 million J of energy per day. This rate of energy consumption is equivalent to about

Accepted Answer

A)  70 W. 
B)  335 W. 
C)  600 W. 
D)  250,000 W. 
A)  70 W. 
B)  335 W. 
C)  600 W. 
D)  250,000 W.

Question 18

On a molecular level heat is

Accepted Answer

A)  kinetic energy. 
B)  potential energy. 
C)  mass energy. 
D)  momentum. 
A)  kinetic energy. 
B)  potential energy. 
C)  mass energy. 
D)  momentum.

Question 19

The watt is a unit of

Accepted Answer

A)  energy. 
B)  work. 
C)  momentum. 
D)  power. 
A)  energy. 
B)  work. 
C)  momentum. 
D)  power.

Question 20

According to the general theory of relativity, gravitation

Accepted Answer

A)  acts only on moving bodies. 
B)  is really a general acceleration of the universe. 
C)  is a distortion in space-time. 
D)  is the same as in Newton's theory but is to be interpreted differently. 
A)  acts only on moving bodies. 
B)  is really a general acceleration of the universe. 
C)  is a distortion in space-time. 
D)  is the same as in Newton's theory but is to be interpreted differently.

An 800-kg car moving at 80 km/h collides head-on with a 1200-kg car moving at 40 km/h in the opposite direction. If they stick together, the wreckage now has an initial speed of

In the formula E₀ = mc², the symbol c represents the speed of

The height above the ground of a child on a swing varies from 0.5 m at the lowest point to 2.0 m at the highest point. The maximum speed of the child is

A 90-kg llama has an average power output of 80 W. The minimum time the llama can go up a hill 500 m high is

An object that has linear momentum must also have

The sun

The linear momentum of a 400-kg giraffe galloping at 5 m/s is

A 1-kg mass has a KE of 1 J when its speed is

Rolling a ball up an inclined plank requires an amount of work proportional to the

Which of the following is are) not a unit of power?

Which of the following quantities is always the same to all observers?

A 1-N weight has a PE relative to the ground of 1 J when it is at a height of

A 1-N weight has a KE of 1 J when its speed is

The 2.5-kg head of an ax exerts a force of 80 kN as it penetrates 18 mm into the truck of a tree. The speed of the ax head when it strikes the tree is

When the speed of an object is doubled,

If a spaceship 100 m long when at rest on the earth were to travel at nine-tenths the speed of light, its length as measured by an observer on the earth would be

A sedentary person requires about 6 million J of energy per day. This rate of energy consumption is equivalent to about

On a molecular level heat is

The watt is a unit of

According to the general theory of relativity, gravitation

The Scientific Method

Motion

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

The Universe Galaxies

Filters

Exam 3: Energy

An 800-kg car moving at 80 km/h collides head-on with a 1200-kg car moving at 40 km/h in the opposite direction. If they stick together, the wreckage now has an initial speed of

In the formula E0 = mc2, the symbol c represents the speed of

The height above the ground of a child on a swing varies from 0.5 m at the lowest point to 2.0 m at the highest point. The maximum speed of the child is

A 90-kg llama has an average power output of 80 W. The minimum time the llama can go up a hill 500 m high is

An object that has linear momentum must also have

The sun

The linear momentum of a 400-kg giraffe galloping at 5 m/s is

A 1-kg mass has a KE of 1 J when its speed is

Rolling a ball up an inclined plank requires an amount of work proportional to the

Which of the following is are) not a unit of power?

Which of the following quantities is always the same to all observers?

A 1-N weight has a PE relative to the ground of 1 J when it is at a height of

A 1-N weight has a KE of 1 J when its speed is

The 2.5-kg head of an ax exerts a force of 80 kN as it penetrates 18 mm into the truck of a tree. The speed of the ax head when it strikes the tree is

When the speed of an object is doubled,

If a spaceship 100 m long when at rest on the earth were to travel at nine-tenths the speed of light, its length as measured by an observer on the earth would be

A sedentary person requires about 6 million J of energy per day. This rate of energy consumption is equivalent to about

On a molecular level heat is

The watt is a unit of

According to the general theory of relativity, gravitation

The Scientific Method

Motion

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

The Universe Galaxies

Filters

In the formula E₀ = mc², the symbol c represents the speed of