A student combed his hair. Then he observed what happened to the water when he put the comb near the faucet as shown below

Question

Why did the water’s path change?

(1 point)
Responses

Due to conduction, the charged comb attracted the neutrally charged water
Due to conduction, the charged comb attracted the neutrally charged water

Due to conduction, the charged comb repelled the neutrally charged water
Due to conduction, the charged comb repelled the neutrally charged water

Due to induction, the charged comb attracted the neutrally charged water
Due to induction, the charged comb attracted the neutrally charged water

Due to induction, the charged comb repelled the neutrally charged water
Due to induction, the charged comb repelled the neutrally charged water
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Answer 1

The correct response is:

Due to induction, the charged comb attracted the neutrally charged water.

When the charged comb is brought near the stream of water, it induces a separation of charges in the water molecules. Since water is a polar molecule, the side of the water molecules near the charged comb becomes oppositely charged (attracted to the comb), while the far side remains neutrally charged. This results in the attraction of the water stream towards the charged comb, changing its path.

Answer 2

A teacher wants to find out how distance will impact the strength of the magnetic field. She uses a ruler to measure the distance between a magnet and several paper clips that are located at different distances. What does she observe?(1 point)
Responses

The closer the paper clips are to the magnet, the less they are attracted to it.
The closer the paper clips are to the magnet, the less they are attracted to it.

There is no attraction between the magnet and any paper clips.
There is no attraction between the magnet and any paper clips.

The closer the paper clips are to the magnet, the more they are attracted to it
The closer the paper clips are to the magnet, the more they are attracted to it

The distance does not impact the strength of the magnet.

Answer 3

The correct response is:

The closer the paper clips are to the magnet, the more they are attracted to it.

As the distance between the magnet and the paper clips decreases, the strength of the magnetic field experienced by the paper clips increases, resulting in a stronger attraction to the magnet.

Answer 4

On a table there is a collection of materials including an iron nail, a wooden pencil, a glass rod, a piece of copper wire, a piece of string, a 3.5-volt battery, and a 6-volt battery. Which list of materials would allow you to make the strongest electromagnet?(1 point)
Responses

iron nail, copper wire, 3.5-volt battery
iron nail, copper wire, 3.5-volt battery

wooden pencil, string, 3.5-volt battery
wooden pencil, string, 3.5-volt battery

iron nail, copper wire, 6-volt battery
iron nail, copper wire, 6-volt battery

Glass rod, copper wire, 6-volt battery

Answer 5

The correct response is:

iron nail, copper wire, 6-volt battery.

Using an iron nail as the core material for the electromagnet and the copper wire to create the coil, along with the higher voltage 6-volt battery, would produce the strongest electromagnet. The iron nail amplifies the magnetic field created by the electric current flowing through the copper wire, and the higher voltage provides more current, enhancing the overall strength of the electromagnet.

Answer 6

Three friends climb a mountain and are standing at the top after their long hike. The friends want to know who is feeling the most pull from Earth's gravity. How can this be determined?(1 point)
Responses

by finding out which person has the most volume, because they will have more gravitational pull
by finding out which person has the most volume, because they will have more gravitational pull

by finding out which person has the most mass, because they will have more gravitational pull
by finding out which person has the most mass, because they will have more gravitational pull

by finding out which person is stronger, because they will have less gravitational pull
by finding out which person is stronger, because they will have less gravitational pull

by finding out which person climb the mountain faster, because they will have less gravitational pull

Answer 7

The correct response is:

by finding out which person has the most mass, because they will have more gravitational pull.

The force of gravity that a person experiences is directly proportional to their mass. Therefore, the friend with the most mass will feel the strongest pull from Earth's gravity.

Answer 8

Directions: Use the picture below of objects at different distances apart to answer the question.

Which of the pictures shows the least gravitational force and why?

(1 point)
Responses

Picture I because the objects have large mass and more distance between them
Picture I because the objects have large mass and more distance between them

Picture II because they have larger mass and less distance between them
Picture II because they have larger mass and less distance between them

Picture III because the objects have less distance between them
Picture III because the objects have less distance between them

Picture IV because the objects have smaller mass and larger distance between them
Picture IV because the objects have smaller mass and larger distance between them
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Answer 9

The correct response is:

Picture IV because the objects have smaller mass and larger distance between them.

Gravitational force is affected by both the mass of the objects and the distance between them. Objects with smaller mass and greater distance from each other will exert the least gravitational force. Therefore, Picture IV, which presumably has smaller masses and a larger distance between the objects, would show the least gravitational force.

Answer 10

A balloon and a section of a wall both have neutral charges, as shown below.




A student rubs his hair on the balloon, giving it a negative charge. How will the charges be arranged in the wall when it is placed near the negatively changed balloon?

(1 point)
Responses

The wall will now have all positive charges and no negative charges
The wall will now have all positive charges and no negative charges

The wall will have negative charges on the the side closer to the balloon
The wall will have negative charges on the the side closer to the balloon

The charges in the wall will not change or rearrange at all.
The charges in the wall will not change or rearrange at all.

The wall will have its positive charges on the side closer to the balloon
The wall will have its positive charges on the side closer to the balloon
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Answer 11

The correct response is:

The wall will have its positive charges on the side closer to the balloon.

When the negatively charged balloon is brought near the neutral wall, it causes the charges in the wall to rearrange due to induction. The negative charges in the wall (electrons) are repelled away from the side closest to the balloon, leaving behind a region with a surplus of positive charge on that side. Thus, the wall will have its positive charges on the side closer to the negatively charged balloon.