Answer:
195
Explanation:
he can only apply as much force as his body mass so it would be 195
I halved the speed of light in vacuum to get the speed of light in the material, since the speed of light in vacuum is twice the speed of light in material.
The index of refraction is essentially the speed of light through a vacuum divided by the speed of light through given medium.
I attached some notes on refraction too, hopefully this helps :D
Answer:

Explanation:
Use the equation:
(where T is the period)
(9 comes from the period of a full wavelength)

Well, in my own personal case, I can actually move the air in either
direction through both of those.
When I move the air inward from the outside, it's warmed and moistened.
When I move it outward from the inside, it's not.