Answer:
In this movement, both the magnitude and the direction of the force change
Explanation:
A body that moves in an elliptical path must be subjected to a force that is pointed towards one of the foci, therefore the force is central.
The magnitude of this force must be greater when the two bodies are closer and its directional changes, but it always points to the focus where the body that originates the force is.
In this movement, both the magnitude and the direction of the force change
Answer:
The three primary factors affect the injury severity of an electric shock: 1) the amount of current passing through the body 2) the duration of the current flow and 3) the current path through the body.
Answer: B. 16 times
Explanation:
The mathematic expression for a magnetic force 
between two magnets is:
(1)
Where:
is a constant
and 
are the magnetic charges, which depends on the size of each magnet
is the distance beteween both magnets
As we can see, this force in inversely proportional to the square of the distance. This means that if we increase the distance, the magnetic force will decrease.
Now, if we increase this value by 4 inches from 1 inch:
(2)
(3)
This means the strength of attraction will be 16 times weaker.
