<span>1) Explain how the particles that make up solid matter can be in perpetual motion if they do not change position. Answer: they do not mov, just vibrate a bit more and move further apart. And as a result solid expand a bit.
</span><span>2) How the Kinetic Theory of Matter defines heat. Answer: Heat is a form of energy that particles convert into kinetic energy. Adding a heat energy increases the kinetic energy of particles. This means that as a substance is heated - the particles vibrate faster and move further apart. </span>
The awnser is: at t = 4 seconds (B).
Answer:
11,520N
Explanation
According to Newtons second law
Net force = mass * acceleration
Given
Mass = 2560kg
acceleration = 4.5m/s^2
Substitute the given values into the formula
F = 2560 * 4.5
F = 11,520N
Hence the net force on the elevator is 11,520N
Light refracts when it crosses the boundary between two types of material in which the speed of light is different.