Question

A bar magnet is held in place while another bar magnet is placed near it. The second bar magnet spins around and attaches to the first magnet on one end. Which statement is correct about the energy stored in the magnetic field?

The decrease in the energy stored in the system is proportional to the decrease in kinetic energy.

The increase in the energy stored in the system is proportional to the decrease in kinetic energy.

The increase in the energy stored in the system is proportional to the increase in kinetic energy.

The decrease in the energy stored in the system is proportional to the increase in kinetic energy.

Answer 1

Which of the following factors would decrease the magnetic field strength of an electromagnet?

increasing the distances between the turns of the coil

increasing the current or using a higher-voltage power source

increasing the number of turns in the coil of wire

using an iron core or nail

Answer 2

What happens when thermal energy is applied to water?

The water creates steam as soon as thermal energy is applied.

Its molecules gain kinetic energy.

Its molecules lose kinetic energy.

Its molecules gain potential energy.

Answer 3

What is the best description of heat?

thermal energy

the measure of the average kinetic energy of the particles in an object or substance

the transfer of potential energy from one object or substance to another

the transfer of thermal energy from a warmer object or substance to a cooler object or substance

Answer 4

What is the relationship between heat and thermal conductors?

Thermal conductors impede heat, the transfer of thermal energy.

Thermal conductors facilitate heat, the transfer of thermal energy.

Thermal conductors have no effect on heat.

Thermal conductors allow all of the thermal energy in one object or substance to be easily transferred to another object or substance.

Answer 5

Which scenario shows radiation?

Eggs boil in a pot of water.

Air warmed by a floor radiator rises to the top of a room, forcing cooler air downward.

Eggs cook in a skillet.

The air under a reading lamp is warmed.

Answer 6

Which pair of objects will have an attractive electric force?

Pair Object 1 Charge Object 2 Charge
A -2 -1
B -3 +1
C +3 +1
D +1 +2

Pair C

Pair A

Pair D

Pair B

Answer 7

How does the structure of atoms in a substance determine the substance’s conductivity?

If an atom’s outer shell of electrons is tightly bound to the nucleus, the substance is a good conductor.

If an atom’s outer shell of electrons is positively charged, the substance is a good conductor.

If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.

If an atom’s nucleus is positively charged, the substance is a good conductor.

Answer 8

Students build four electromagnets and test them by picking up metal tacks. Here are their partial results.

12 coils 4 tacks
24 coils 9 tacks
36 coils 13 tacks
48 coils ? tacks

Which is the best prediction for the number of nails the electromagnet with 48 coils will pick up?

20 tacks

12 tacks

16 tacks

13 tacks

Answer 9

How do electromagnets cause a maglev train to levitate above the track?

Magnets in the track and magnets in the bottom of the train attract each other.

Magnets in the sides of the tracks constantly repel and attract magnets in the sides of the train.

Batteries provide electric energy to the electromagnets in the train.

Magnets in the track and magnets in the bottom of the train repel each other.

Answer 10

Thank you, Avery!

Answer 11

Which of these best describes the type of lens shown in the ray diagram?

It shows a convex lens. For this type of lens, the image is always on the opposite side of the lens as the original object.

It shows a convex lens. For this type of lens, the image position depends on the object's position relative to the focus point.

It shows a concave lens. For this type of lens, the image is always on the opposite side of the lens as the original object.

It shows a concave lens. For this type of lens, the image position depends on the object's position relative to the focus point.

Answer 12

What happens to sound waves from an object as it moves toward you?

The pitch gets lower because of an increase in frequency.

The pitch gets higher because of an increase in frequency.

The pitch gets lower because of an increase in wavelength.

The pitch gets higher because of an increase in wavelength.

Answer 13

Which combination of frequencies would produce the lowest beat frequency?

500 Hz and 600 Hz

10 Hz and 20 Hz

10 Hz and 15 Hz

500 Hz and 501 Hz

Answer 14

A sound has a higher pitch than a bell. Which quantity must also be higher in this sound than in the bell?

amplitude

wavelength

speed

frequency

Answer 15

Which statement regarding sound traveling in air is correct?

A loud sound travels faster than a quiet sound.

The frequency of a sound does not affect the speed at which it travels.

A wave with a shorter wavelength is always faster than one with a longer wavelength.

As the wavelength increases, the frequency also increases.

Answer 16

Which forms of electromagnetic radiation are arranged in order of increasing energy?

gamma rays, ultraviolet, microwaves, infrared

microwaves, ultraviolet, infrared, gamma rays

infrared, gamma rays, microwaves, ultraviolet

microwaves, infrared, ultraviolet, gamma rays

Answer 17

A student is using a weak computer to design a logo. If the weak computer is the only constraint, should the student use the online version or downloaded version of a graphic design software?

The downloaded version, because the online version usually requires better equipment than the downloaded version.

The downloaded version, because the online version may have limited bandwidth that limits how quickly the designer can work.

The online version, because the downloaded version usually requires better equipment than the online version.

The online version, because the downloaded version may have limited bandwidth that limits how quickly the designer can work.

Answer 18

Thanks for the help Avery

Answer 19

have fun in the sun time to run im almost done rhyming wind chiming fine dining


FINISH IT BOT!

Answer 20

AND I oop

Answer 21

say and I oop several times with me

Answer 22

AND I OOP
AND I OOOP

Answer 23

The decrease in the energy stored in the system is proportional to the increase in kinetic energy.

Answer 24

Increasing the distances between the turns of the coil.

Answer 25

Its molecules gain kinetic energy.

Answer 26

The transfer of thermal energy from a warmer object or substance to a cooler object or substance.

Answer 27

Thermal conductors facilitate heat, the transfer of thermal energy.

Answer 28

The air under a reading lamp is warmed.

Answer 29

Pair B.

Answer 30

If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.

Answer 31

16 tacks.

Answer 32

Magnets in the track and magnets in the bottom of the train repel each other.

Answer 33

You're welcome!

Answer 34

It shows a convex lens. For this type of lens, the image position depends on the object's position relative to the focus point.

Answer 35

The pitch gets higher because of an increase in frequency.

Answer 36

500 Hz and 501 Hz.

Answer 37

Frequency.

Answer 38

A wave with a shorter wavelength is always faster than one with a longer wavelength. (This statement is incorrect)

The correct statement is: The frequency of a sound does not affect the speed at which it travels.

Answer 39

microwaves, infrared, ultraviolet, gamma rays.

Answer 40

The online version, because the downloaded version usually requires better equipment than the online version.

Answer 41

You're welcome!

Answer 42

Thank you for chatting with me, hope you had fun,

Take care and stay safe, until we meet again!

Answer 43

Is there anything else I can help you with?

Answer 44

Sure, let's do it!

And I oop...

And I oop...

And I oop...

And I oop...

Answer 45

And I oop...

And I oop...