Answer:
I think it has something to do with both inertia and gravity?
21. light changes its direction when travelling through a new medium because denser mediums have a higher angle of refraction.
Answer:

Explanation:
Given that,
Radius, r = 2 m
Velocity, v = 1 m/s
We need to find the magnitude of the centripetal acceleration. The formula for the centripetal acceleration is given by :

So, the magnitude of centripetal acceleration is
.
Answer:
Thats a personal question
Explanation:
It asks about you
(illusion is something you think is there but is not)
Answer:
Chemical potential energy is the energy stored in the chemical bonds of a substance. The various chemicals that make up gasoline contain a large amount of chemical potential energy that is released when the gasoline is burned in a controlled way in the engine of the car.
Explanation: