Answer:
Explanation:
The law of gravitation
Universal gravitational constant [S.I. units]
Mass of Earth [S.I. units]
Mass of a man in a spacecraft [S.I. units]
Earth radius [km]
Distance between man and the earth's surface
ESULT
<span> it is electromagnetic waves that are made up of oscillating magnetic and electric fields </span>
Answer:
The speed of the chair just before impact is 22.54 m/s
Explanation:
From the question,
The chair was initially at rest, that is, the initial velocity of the chair is 0 m/s.
Since the chair was thrown from a balcony, the chair will fall freely due to gravity.
To determine the speed of the chair just before impact, we will determine the final velocity of the chair.
From one of the equations of linear motion for objects falling freely due to gravity,
v = u + gt
Where v is the final velocity
u is the initial velocity
g is the acceleration due to gravity (Take g = 9.8 m/s²)
and t is time
From the question,
u = 0 m/s
t = 2.3 secs
Then, v = u + gt becomes
v = 0 + (9.8)(2.3)
v = 9.8 × 2.3
v = 22.54 m/s
Hence, the speed of the chair just before impact is 22.54 m/s.
Olbers' paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the question? Why is the sky dark at night?
Universe is finite
In that it hasn't existed indefinitely, the observable universe is finite. From Earth, it stretches 46 billion light years in every direction. (Our universe is 13.8 billion years old, but because the cosmos is expanding, we can observe more of it.)
Astronomers are able to look back in time to the seconds immediately following the Big Bang thanks to developing technologies. This may give the impression that we can see the entire cosmos. But a lot of factors, such as the universe's form and expansion, affect how big the cosmos is.
Because of this, scientists are unable to determine the exact size of the universe, however, we can make guesses.
To learn more about the universe finite refer here:
brainly.com/question/14454625
#SPJ4
Answer:
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Explanation:
sorry don't speak this language