Answer:
Mars
Explanation:
In the 1960s, humans set out to discover what the red planet has to teach us. Now, NASA is hoping to land the first humans on Mars by the 2030s. Mars has captivated humans since we first set eyes on it as a star-like object in the night sky.
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An impulsive force is a force that is acting only during a short time, I mean, for an instant. Impulse is a physics magnitude define by the product of the impulsive force and the time that it was acting.
Is there any mistake in my English? Please, let me know.
Answer:
<em>a. Aristarchus</em> was the Greek scientist who concluded that the sun is the centre of the solar system, and that the Earth revolves around the Sun
Explanation:
<em>Aristarchus</em> was a Greek scientist who studied astronomy. He concluded that the sun is the centre of the solar system, and that the Earth revolves around the Sun (that it was Heliocentric).
Answer: The magnitude of the force exerted on the roof is 490522.5 N.
Explanation:
The given data is as follows.
Below the roof, 
= 0 m/s
At top of the roof, 
= 39 m/s
We assume that 
is the pressure at lower surface of the roof and 
be the pressure at upper surface of the roof.
Now, according to Bernoulli's theorem,
= ![0.5 \times 1.29 \times [(39)^{2} - (0)^{2}]](https://tex.z-dn.net/?f=0.5%20%5Ctimes%201.29%20%5Ctimes%20%5B%2839%29%5E%7B2%7D%20-%20%280%29%5E%7B2%7D%5D)
= 
= 981.045 Pa
Formula for net upward force of air exerted on the roof is as follows.
F = 
= 
= 490522.5 N
Therefore, we can conclude that the magnitude of the force exerted on the roof is 490522.5 N.
