Question 1

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. D

Question 2

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. B

Question 3

A 150-kg safe on frictionless casters is being raised 1.20 m to the bed of a truck using planks 4.00 m long.The force needed to push the safe up is

Accepted Answer

A) 441 N. 
B) 450 N. 
C) 500 N. 
D) 1470 N. 
A) 441 N. 
B) 450 N. 
C) 500 N. 
D) 1470 N. A

Question 4

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 5

A bowling ball rolling on level ground at the speed v strikes a basketball at rest.The basketball moves off in the original direction of the bowling ball

Accepted Answer

A) with the speed v while the bowling ball stops. 
B) faster than v while the bowling ball continues slower than v. 
C) with the speed v while the bowling ball moves backward. 
D) together with the bowling ball at the same speed of less than v. 
A) with the speed v while the bowling ball stops. 
B) faster than v while the bowling ball continues slower than v. 
C) with the speed v while the bowling ball moves backward. 
D) together with the bowling ball at the same speed of less than v.

Question 6

The speed of a 1000-kg car whose KE is 450 kJ is

Accepted Answer

A) 21 m/s. 
B) 30 m/s. 
C) 45 m/s. 
D) 900 m/s. 
A) 21 m/s. 
B) 30 m/s. 
C) 45 m/s. 
D) 900 m/s.

Question 7

A golf ball and a ping-pong ball are dropped in a vacuum chamber.When they have fallen halfway down, they have the same

Accepted Answer

A) speed. 
B) potential energy. 
C) kinetic energy. 
D) rest energy. 
A) speed. 
B) potential energy. 
C) kinetic energy. 
D) rest energy.

Question 8

The mechanical advantage of a pair of scissors might be

Accepted Answer

A) 0. 
B) 1/2. 
C) 2. 
D) -2. 
A) 0. 
B) 1/2. 
C) 2. 
D) -2.

Question 9

An 800-kg car moving at 80 km/h overtakes a 1200-kg car moving at 40 km/h in the same direction.If the two cars stick together, the wreckage 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 10

Which one or more of the following is a vector quantity?

Accepted Answer

A)  Linear momentum. 
B)  Angular momentum. 
C)  Kinetic energy. 
D)  Potential energy. 
E)  Both A and B. 
A)  Linear momentum. 
B)  Angular momentum. 
C)  Kinetic energy. 
D)  Potential energy. 
E)  Both A and B.

Question 11

A 2-kg book is held 1 m above the floor for 50 s.The work done is

Accepted Answer

A) 0. 
B) 10.2 J. 
C) 100 J. 
D) 980 J. 
A) 0. 
B) 10.2 J. 
C) 100 J. 
D) 980 J.

Question 12

A moving object does not necessarily have

Accepted Answer

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

Question 13

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 14

A ball whose momentum is mv strikes a wall and bounces off.The change in the ball's momentum is

Accepted Answer

A) 0. 
B) 0.5 mv 
C) mv 
D) 2 mv 
A) 0. 
B) 0.5 mv 
C) mv 
D) 2 mv

Question 15

Six kJ of work is used to lift an object to a height of 100 m.The object's approximate mass is

Accepted Answer

A) 600 g. 
B) 6 kg. 
C) 60 kg. 
D) 600 kg. 
A) 600 g. 
B) 6 kg. 
C) 60 kg. 
D) 600 kg.

Question 16

If a shell fired from a cannon explodes in midair,

Accepted Answer

A) its total momentum increases. 
B) its total momentum decreases. 
C) its total KE increases. 
D) its total KE decreases. 
A) its total momentum increases. 
B) its total momentum decreases. 
C) its total KE increases. 
D) its total KE decreases.

Question 17

When the speed v of an object of mass m approaches the speed of light c, its kinetic energy

Accepted Answer

A) is less than   mv2. 
B) equals   mv2. 
C) is more than   mv2 but less than   mc2. 
D) is more than   mv2 and can exceed   mc2. 
A) is less than   mv2. 
B) equals   mv2. 
C) is more than   mv2 but less than   mc2. 
D) is more than   mv2 and can exceed   mc2.

Question 18

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s.Her recoil speed is

Accepted Answer

A) 0.2 mm/s. 
B) 2 mm/s. 
C) 2 cm/s. 
D) 20 cm/s. 
A) 0.2 mm/s. 
B) 2 mm/s. 
C) 2 cm/s. 
D) 20 cm/s.

Question 19

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.

Question 20

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.

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

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

A 150-kg safe on frictionless casters is being raised 1.20 m to the bed of a truck using planks 4.00 m long.The force needed to push the safe up is

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

A bowling ball rolling on level ground at the speed v strikes a basketball at rest.The basketball moves off in the original direction of the bowling ball

The speed of a 1000-kg car whose KE is 450 kJ is

A golf ball and a ping-pong ball are dropped in a vacuum chamber.When they have fallen halfway down, they have the same

The mechanical advantage of a pair of scissors might be

An 800-kg car moving at 80 km/h overtakes a 1200-kg car moving at 40 km/h in the same direction.If the two cars stick together, the wreckage has an initial speed of

Which one or more of the following is a vector quantity?

A 2-kg book is held 1 m above the floor for 50 s.The work done is

A moving object does not necessarily have

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

A ball whose momentum is mv strikes a wall and bounces off.The change in the ball's momentum is

Six kJ of work is used to lift an object to a height of 100 m.The object's approximate mass is

If a shell fired from a cannon explodes in midair,

When the speed v of an object of mass m approaches the speed of light c, its kinetic energy

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s.Her recoil speed is

According to the general theory of relativity, gravitation

When the speed of an object is doubled,

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

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Organic Chemistry

Atmosphere and Hydrosphere

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The Evolving Earth

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Exam 3: Energy

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

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

A 150-kg safe on frictionless casters is being raised 1.20 m to the bed of a truck using planks 4.00 m long.The force needed to push the safe up is

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

A bowling ball rolling on level ground at the speed v strikes a basketball at rest.The basketball moves off in the original direction of the bowling ball

The speed of a 1000-kg car whose KE is 450 kJ is

A golf ball and a ping-pong ball are dropped in a vacuum chamber.When they have fallen halfway down, they have the same

The mechanical advantage of a pair of scissors might be

An 800-kg car moving at 80 km/h overtakes a 1200-kg car moving at 40 km/h in the same direction.If the two cars stick together, the wreckage has an initial speed of

Which one or more of the following is a vector quantity?

A 2-kg book is held 1 m above the floor for 50 s.The work done is

A moving object does not necessarily have

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

A ball whose momentum is mv strikes a wall and bounces off.The change in the ball's momentum is

Six kJ of work is used to lift an object to a height of 100 m.The object's approximate mass is

If a shell fired from a cannon explodes in midair,

When the speed v of an object of mass m approaches the speed of light c, its kinetic energy

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s.Her recoil speed is

According to the general theory of relativity, gravitation

When the speed of an object is doubled,

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

Filters

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