Bobby hangs two inflated balloons from 2-meter strings so that they touch. He then holds the balloons apart and rubs each balloon 5 times with animal fur. He then releases the balloons. The balloons now hang a small distance apart from one another:

Question

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The next step in Bobby's procedure is to touch the balloons with a metal rod and allow them to settle, and then to rub them 10 times with animal fur. Which result should he expect, and why?

(1 point)
Responses

The balloons will hang at the same elevation, because electrical repulsion is an unvarying phenomenon which results from the existence of charge and not its quantity.

The balloons will hang at a greater elevation, because they will have greater charges so the force of electrical repulsion between them will be greater.
The balloons will hang at a greater elevation, because they will have greater charges so the force of electrical repulsion between them will be greater.

The balloons will hang at a smaller elevation, because more thoroughly rubbing them will more completely remove their charges, reducing the electrical repulsion between them.
The balloons will hang at a smaller elevation, because more thoroughly rubbing them will more completely remove their charges, reducing the electrical repulsion between them.

The balloons will hang straight down or more closely together, because a larger number of rubs with fur will give them opposite rather than like electrical charges
The balloons will hang straight down or more closely together, because a larger number of rubs with fur will give them opposite rather than like electrical charges
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GPT-4o mini · Answer

After Bobby rubs the balloons with animal fur, they become charged due to the transfer of electrons. When he rubs each balloon, they both gain the same type of charge, which leads to repulsion when they are released.

When Bobby touches the balloons with a metal rod, it allows charges to redistribute. Since the metal rod is a conductor, it can equalize charges. If both balloons have the same charge and the rod is touched to both, the charges will stay the same after being held apart.

When Bobby rubs them again with the animal fur, he will likely be increasing the charge on both balloons, making them both have an even greater degree of the same type of charge (either both positive or both negative).

Given this understanding, the most accurate expectation after performing the second rubbing is:

The balloons will hang at a greater elevation, because they will have greater charges so the force of electrical repulsion between them will be greater.

BTS ARMY · Answer

Read the passage about an investigation and answer the following question:

Camila is performing an investigation in which she wraps a current-carrying wire around an iron rod. She places the north pole of a bar magnet near the top of the rod. The magnet moves away from the rod. Camila claims that a field exists between the rod and the magnet.

Which argument best supports Camila’s claim?

(1 point)
Responses

The current in the wire has created a magnetic field with its north pole at the top of the rod.
The current in the wire has created a magnetic field with its north pole at the top of the rod.

The current in the wire has created a magnetic field with its south pole at the top of the rod.
The current in the wire has created a magnetic field with its south pole at the top of the rod.

The current in the wire has created a gravitational field with its north pole at the top of the rod.
The current in the wire has created a gravitational field with its north pole at the top of the rod.

The current in the wire has created a gravitational field with its south pole at the top of the rod.
The current in the wire has created a gravitational field with its south pole at the top of the rod.
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GPT-4o mini · Answer

To support Camila's claim that a magnetic field exists between the rod and the magnet, we need to focus on the properties of electromagnetism. When an electric current flows through a wire, it generates a magnetic field around it. The direction of this magnetic field can be determined by using the right-hand rule.

In Camila's experiment, as she wraps a current-carrying wire around the iron rod, the current creates a magnetic field. Since the north pole of the bar magnet is being repelled and moves away from the rod, it indicates that there is indeed a magnetic field present between the rod and the magnet, likely of the same polarity (north) as that of the magnet.

Based on this reasoning, the best argument to support Camila's claim is:

The current in the wire has created a magnetic field with its north pole at the top of the rod.

This statement correctly implies that a magnetic field generated by the current-carrying wire interacts with the existing magnetic field of the magnet, helping to explain why the magnet is moving away.

BTS ARMY · Answer

Jade has an iron rod around which she wraps copper wire. She places the device on a table near a compass. What will she observe about the compass if she sends current through the copper wire?(1 point)
Responses

The needle of the compass will show no effect.
The needle of the compass will show no effect.

The needle of the compass will point toward the device.
The needle of the compass will point toward the device.

The needle of the compass will stop working.
The needle of the compass will stop working.

The needle of the compass will spin in circles.

GPT-4o mini · Answer

When Jade sends current through the copper wire wrapped around the iron rod, she is essentially creating an electromagnet. The flow of electric current through the wire generates a magnetic field around the wire and the iron rod, which can influence nearby magnetic materials, such as the compass.

The compass needle is a small magnet that aligns itself with the magnetic field in its vicinity. When the current is flowing through the wire, the magnetic field it generates will interact with the compass's magnetic field.

In this case, the correct response is:

The needle of the compass will point toward the device.

This is because the magnetic field generated by the current in the wire will attract the compass needle, causing it to align itself with the new magnetic field created by the current.

BTS ARMY · Answer

Look at the picture below of the Earth and the moon. The arrows represent their gravitational attraction to each other.

Image

The Earth and the moon have the strongest gravitational attraction when ________.

(1 point)
Responses

the moon is full
the moon is full

the moon faces North America
the moon faces North America

when the moon and Earth are closest together
when the moon and Earth are closest together

the moon and Earth are farthest apart
the moon and Earth are farthest apart
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GPT-4o mini · Answer

The gravitational attraction between the Earth and the Moon is strongest when the two bodies are closest to each other. This occurs during a phenomenon known as "perigee," which is when the Moon is at its closest point to Earth in its elliptical orbit.

Therefore, the correct response is:

when the moon and Earth are closest together.

BTS ARMY · Answer

For two charges to attract each other, both must be ______________.(1 point) Responses opposite opposite neutral neutral positive positive negative negative

GPT-4o mini · Answer

For two charges to attract each other, both must be ______________.(1 point)
Responses

opposite
opposite

neutral
neutral

positive
positive

negative
negative

BTS ARMY · Answer

is 25=x2+y2 linear, nonlinear, Function, or not a function

GPT-4o mini · Answer

The equation $ 25 = x^2 + y^2 $ represents a circle centered at the origin (0,0) with a radius of 5. To analyze its properties: 1. **Linear vs. Nonlinear:** The equation is nonlinear because it contains terms with variables raised to powers greater than one (specifically, $x^2$ and $y^2$). 2. **Function vs. Not a Function:** For an equation to be classified as a function, every input (x-value) must correspond to exactly one output (y-value). In the case of the circle, for some x-values, there are two corresponding y-values (one positive and one negative). For example, if $ x = 0 $, then $ y^2 = 25 $, which gives $ y = 5 $ and $ y = -5 $. Therefore, it does not meet the criteria of a function. In summary: - The equation $ 25 = x^2 + y^2 $ is **nonlinear** and **not a function**.