Answer:
Magnetic compass
Explanation:
A magnetic field is a field that describes the magnetic effect of electric charges in a relative motion.
Magnetic field allows magnets to interact without contact. The principle involved in the function of the compass is that a magnetic field exerts a force on any moving charge and can be measured and detected by this effect.
Answer:

Explanation:
Let x be the distance to the shore
From trigonometry properties:

Answer: True!
Explanation: The force is proportional to the square of the distance between 2 point masses
Answer: The statement that supports Newton's first law of motion is the one that says that planets can move at a varying speed due to forces exerted in space