Answer:
= 1.6
Explanation:
= Angle of incidence = 65.9°
= Angle of refraction = 34.8°
= Index of refraction of air = 1
= Index of refraction of glass = ?
Using Snell's law
Sin
=

(1) Sin65.9 =
Sin34.8
= 1.6
To do this you would take 64 and divide it by 4.
64/4= 16.
Your answer is 16.
Answer:
20 hertz of frequency produced.
Explanation:

Here we will find frequency and period should be in second, here given: 0.05 seconds
using the formula:


Explanation:
It is given that,
Initial speed of the broad jump, u = 12 m/s
It is launched at an angle of 20 degrees above the horizontal. Let t is the time for which the track star i in the air before returning to Earth. The motion of the track star in the broad jump can be treat as the projectile motion. The time of flight of the projectile is given by :

Putting all the values in above equation as :

t = 0.837 seconds
So, the time for which the track star is in air is 0.837 seconds. Hence, this is the required solution.
Answer:
When you have a cloudy night, the clouds prevent heat from escaping through the atmosphere and into space.
The clouds act like a blanket and trap the heat it, and that is why every time you have a cloudy night, it is always warmer than a clear night.