Exam 3: Energy and Conservation Laws

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The linear momentum of the crate is Fv.

(True/False)

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Question 41

In a collision the total ____________ is the same before and after.

(Short Answer)

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Question 42

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The linear momentum of the crate is __________.

(Short Answer)

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Question 43

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The potential energy of the crate is mgd.

(True/False)

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Question 44

When we say work is done against a force,we mean the force does

(Multiple Choice)

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Question 45

A 15,000-watt motor is used to lift a 18,000 kg aircraft to a height of 10 m.How much time does it take to lift the aircraft with the motor?

(Short Answer)

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Question 46

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The potential energy of the crate is __________.

(Short Answer)

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Question 47

A worker on top of a radar tower 80 m high drops a wrench off the tower.The speed of the wrench when it hits the ground is ____________

(Short Answer)

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Question 48

Match each item with the correct statement below. -can be stored in a spring

(Multiple Choice)

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Question 49

Match each item with the correct statement below. -type of collision in which kinetic energy is conserved

(Multiple Choice)

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Question 50

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Angular momentum __________ conserved.

(Short Answer)

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Question 51

The energy stored in a pile driver is an example of __________ energy.

(Short Answer)

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Question 52

A 2-kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s,and they stick together.After the collision,the velocity of the combined bodies is m/s pointing .

(Short Answer)

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Question 53

After an elastic collision of two balls,the kinetic energies of the two balls are measured to be 12 J and 24 J.What can be said about the kinetic energy of the two balls before the collision?

(Multiple Choice)

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Question 54

What are the SI units of momentum?

(Multiple Choice)

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Question 55

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The work you do on the crate is __________.

(Short Answer)

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Question 56

If a force on an object is aimed in the direction of the object's velocity,the force does

(Multiple Choice)

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Question 57

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -After the dropped box hits the floor,its kinetic energy is

(Multiple Choice)

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Question 58

Work is done on an object when

(Multiple Choice)

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Question 59

The energy stored in a stretched spring is an example of __________ energy.

(Short Answer)

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Question 60

Showing 41 - 60 of 140

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The linear momentum of the crate is Fv.

In a collision the total ____________ is the same before and after.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The linear momentum of the crate is __________.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The potential energy of the crate is mgd.

When we say work is done against a force,we mean the force does

A 15,000-watt motor is used to lift a 18,000 kg aircraft to a height of 10 m.How much time does it take to lift the aircraft with the motor?

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The potential energy of the crate is __________.

A worker on top of a radar tower 80 m high drops a wrench off the tower.The speed of the wrench when it hits the ground is ____________

Match each item with the correct statement below. -can be stored in a spring

Match each item with the correct statement below. -type of collision in which kinetic energy is conserved

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Angular momentum __________ conserved.

The energy stored in a pile driver is an example of __________ energy.

A 2-kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s,and they stick together.After the collision,the velocity of the combined bodies is m/s pointing .

After an elastic collision of two balls,the kinetic energies of the two balls are measured to be 12 J and 24 J.What can be said about the kinetic energy of the two balls before the collision?

What are the SI units of momentum?

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The work you do on the crate is __________.

If a force on an object is aimed in the direction of the object's velocity,the force does

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -After the dropped box hits the floor,its kinetic energy is

Work is done on an object when

The energy stored in a stretched spring is an example of __________ energy.

The Study of Motion

Newtons Laws

Physics of Matter

Temperature and Heat

Waves and Sound

Electricity

Electromagnetism and Em Waves

Optics

Atomic Physics

Nuclear Physics

Special Relativity and Elementary Particles

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Exam 3: Energy and Conservation Laws

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The linear momentum of the crate is Fv.

In a collision the total ____________ is the same before and after.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The linear momentum of the crate is __________.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The potential energy of the crate is mgd.

When we say work is done against a force,we mean the force does

A 15,000-watt motor is used to lift a 18,000 kg aircraft to a height of 10 m.How much time does it take to lift the aircraft with the motor?

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The potential energy of the crate is __________.

A worker on top of a radar tower 80 m high drops a wrench off the tower.The speed of the wrench when it hits the ground is ____________

​Match each item with the correct statement below.​ -can be stored in a spring

​Match each item with the correct statement below.​ -type of collision in which kinetic energy is conserved

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Angular momentum __________ conserved.

The energy stored in a pile driver is an example of __________ energy.

A 2-kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s,and they stick together.After the collision,the velocity of the combined bodies is __________ m/s pointing __________.

After an elastic collision of two balls,the kinetic energies of the two balls are measured to be 12 J and 24 J.What can be said about the kinetic energy of the two balls before the collision?

What are the SI units of momentum?

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The work you do on the crate is __________.

If a force on an object is aimed in the direction of the object's velocity,the force does

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -After the dropped box hits the floor,its kinetic energy is

Work is done on an object when

The energy stored in a stretched spring is an example of __________ energy.

The Study of Motion

Newtons Laws

Physics of Matter

Temperature and Heat

Waves and Sound

Electricity

Electromagnetism and Em Waves

Optics

Atomic Physics

Nuclear Physics

Special Relativity and Elementary Particles

Filters

Match each item with the correct statement below. -can be stored in a spring

Match each item with the correct statement below. -type of collision in which kinetic energy is conserved

A 2-kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s,and they stick together.After the collision,the velocity of the combined bodies is m/s pointing .