Answer:
4.7 x 10³ rad / s
Explanation:
During the time light goes and comes back , one slot is replaced by next slot while rotating before the light source
Time taken by light to travel a distance of 2 x 500 m is
= (2 x 500) / 3 x 10⁸
= 3.333 x 10⁻⁶ s .
In this time period, two consecutive slots come before the source of light one after another by rotation. There are 400 slots so time taken to make one rotation
= 3.333 x 10⁻⁶ x 400
= 13.33 x 10⁻⁴ s
This is the time period so
T = 13.33 X 10⁻⁴
Angular speed
= 2π / T
= 
4.7 x 10³ rad / s
Answer:
A. They trap energy in the atmosphere.
Explanation:
Greenhouse gases are defined as gases that absorb and emit radiation within the infrared range. These gases allow the sun’s rays to pass through the ozone layer and warm the earth, but prevent this warmth from escaping atmosphere.
Greenhouse gases cause the greenhouse effect on planets. Examples of greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, ozone etc.
Explanation:
I hesitate to articulate upon the highest degree of accuracy!
It hardens because you are pressing it against something.
The average force is 
Explanation:
We can solve this problem by applying the impulse theorem, which states that the impulse exerted on the bullet (product of force and time) is equal to the change in momentum of the bullet:
where
F is the average force exerted by the block on the bullet
is the duration of the collision
m is the mass of the bullet
v is its final velocity
u is its initial velocity
Here we have:
m = m
v = 0 (the bullet comes to rest)
And solving for F, we find the average force:
where the negative sign means the direction of the force is opposite to the direction of motion of the bullet.
Learn more about impulse:
brainly.com/question/9484203
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