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2 years ago

Why do the stars appear to rotate around Polaris?

2 answers:

6 0

Because Polaris known as the North Star does not rotate due to it's exact location so everything else rotates around it.

Lerok [7]2 years ago

4 0

<span>The star Polaris is almost in line with the axis of earth. So when earth rotates it does not appear to rotate in circles.</span>

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A net force of 100 N is moving a mass with an acceleration of 5 m/s2. What is the mass of the object?

olya-2409 [2.1K]

Fnet=ma so m = fnet/a 100/5=20 the mass is 20

7 0

3 years ago

Why were quasars and active galaxies not initially recognized as being “special” in some way?

djyliett [7]

Answer:

In the past, astronomers look into the sky and the universe as a whole with an idea that it is a place where stars are born, transition through their life stages and ultimately die and this is because they couldnt differentiate between stars, quasars and active galaxies because with advanced equipment, they all look similar but as they technological ages arrived, they were able see that they are not the same.

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3 years ago

Jack travels 80 km in 50 minutes. What is his speed in m/s?

Pie

Answer:

1.6 m/s?

Explanation:

80 ÷ 50 = 1.6 m/s

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3 years ago

A ball rolls off the edge of a table with a fairly large horizontal velocity. Which of the following statements are true? (Selec

Degger [83]

Answer:

A.The vertical velocity is constantly increasing as the ball falls.

B.The horizontal velocity does not noticeably change as the ball falls.

G.The horizontal velocity does not affect how long it will take the ball to fall to the floor.

H.The velocity vector of the ball changes as it travels through the air.

Explanation:

As the ball is projected horizontally so here the vertical component of the velocity is zero

So the time to reach the ground is given as

$H = \frac{1}{2} gt^2$

so we will have

$t = \sqrt{\frac{2H}{g}}$

so this is the same time as the ball is dropped from H height

Since there is no force in horizontal direction so its horizontal velocity will always remain constant while vertical velocity will change at constant rate which is equal to acceleration due to gravity.

So overall the velocity vector will change due to net acceleration g

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3 years ago

Why is it helpful to study the light that comes off stars?

asambeis [7]

It is helpful to study the light that comes off stars because C. The light from a star gives hints of what elements make up a star.

6 0

3 years ago