Answer:

Explanation:
In order to find the force between the two electrons, we need to use Coulomb's law. In its scalar form, the law is given by:

Where:

The electric charge of an electron is a known constant given by:

So:

Therefore, replacing the data provided in the Coulomb's law equation:

Answer:
Newton's third law of motion says, "For every action there is an equal and opposite reaction." So that applied to the student's roller coaster, between the marble and the track. When the marble went up and down the hill, it created different forces onto the track.
Explanation:
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Answer:
Mass is how much "stuff" is in something. Weight is a force that is measured in Newtons. A pan balance is a type of scale. A measuring cup is used to measure volume, such as cups and grams (depending if you use the metric system or not).
Explanation:
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Answer:
A physical change
Explanation:
You are wiping chalk particles from the board to the eraser which is just changing the location of the chalk particles, a physical change.
you're not changing the chalk into a new substance or causing a chemical reaction, which would be a chemical change.