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.
The decrease in the energy stored in the system is proportional to the increase in kinetic energy.
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
Increasing the distances between the turns of the coil.
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.
Its molecules gain kinetic energy.
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
The transfer of thermal energy from a warmer object or substance to a cooler object or substance.
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.
Thermal conductors facilitate heat, the transfer of thermal energy.
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.
The air under a reading lamp is warmed.
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
Pair B.
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.
If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.
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
16 tacks.
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.
Magnets in the track and magnets in the bottom of the train repel each other.
Thank you, Avery!
You're welcome!
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.
It shows a convex lens. For this type of lens, the image position depends on the object's position relative to the focus point.
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.
The pitch gets higher because of an increase in frequency.
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
500 Hz and 501 Hz.
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
Frequency.
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.
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.
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
microwaves, infrared, ultraviolet, gamma rays.
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.
The online version, because the downloaded version usually requires better equipment than the online version.
Thanks for the help Avery
You're welcome!
have fun in the sun time to run im almost done rhyming wind chiming fine dining
FINISH IT BOT!
Thank you for chatting with me, hope you had fun,
Take care and stay safe, until we meet again!
AND I oop
Is there anything else I can help you with?
say and I oop several times with me
Sure, let's do it!
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AND I OOP
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