Why does time seem to flow only in one direction? What happens in the gray zone between solid and liquid? Can we find a unified theory of physics?
Answer:
The First law of motion
Explanation:
The firat law states that an object either remains at rest or continues to move at a constant velocety unless acted upon by an external force
Answer:
Their speed in a vacuum is a constant value.
Explanation:
Electromagnetic waves consits of oscillations of electric field and magnetic field. The oscillations of these fields occur in a direction perpendicular to the direction of propagation of the waves, so they are transverse wave. Electromagnetic waves, contrary to mechanical waves, do not need a medium to propagate, so they can also travel through a vacuum. In a vacuum, their speed is constant and has always the same value, the speed of light:
