The answer would be B. This is because all planets in our galaxy orbit the sun.
The center-seeking change in velocity of an object moving in a circle is the centripetal acceleration.
So, by Newton's laws, we know that an object moving with a given velocity will remain in constant motion with a constant velocity until we apply an acceleration.
So we define acceleration as the rate of change of the velocity, also remember that velocity is a vector (has magnitude and direction), so, if there is a change the direction of the velocity, we have an acceleration that causes that.
In circular motion, the velocity vector is always perpendicular to the radius of the circle, and it can only be possible if the velocity direction is changing constantly. This will happen because of something called centripetal acceleration.
This acceleration points radially inwards (to the center of the circle) so is also perpendicular to the velocity of the moving object, and this is what causes the constant change in the direction of the velocity of the moving object.
Just to give an example, if you have a string with a mass on one end, and with your hand, you rotate the mass (from the string), the tension of the string would be the centripetal acceleration.
If you want to learn more about circular motion, you can read:
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a) The force is repulsive
b) The force is attractive
Explanation:
Every magnet has a magnetic field around it. It is possible to distinguish two different poles in the magnet, according to the direction of the magnetic field: in particular, the lines of the field go out from the North pole and go into the South Pole. When a magnet is broken, two new magnets are formed, each of them having its own north and south pole.
The force between two magnets can be either attractive or repulsive, depending on which poles are facing each other. We have the following situation:
- The magnetic force between two like poles (north-north and south-south) is repulsive
- The magnetic force between two opposite poles (north-south) is attractive
Therefore, we have the following situations in this problem:
a)
Here we are holding the two north poles together: since they are like poles, they repel each other, so the force in this case is repulsive
b)
Here we are holding a north pole and a south pole together: since they are opposite poles, they attract each other, so the force in this case is attractive
Learn more about magnetic fields:
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