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Alex73 [517]
3 years ago
7

Suppose a star is 500 light- years away from earth is moved to be 600 light - years away. Which statement is correct?

Physics
2 answers:
mina [271]3 years ago
5 0
D. the value of the star's apparent magnitude increases
ExtremeBDS [4]3 years ago
4 0

Answer:

Explanation:

Apparent magnitude of a star is the brightness of the star observed from the Earth at its actual position. The value extends in both positive and negative direction. Increasing value of apparent magnitude in positive direction means that the brightness is decreasing. Absolute magnitude is the apparent magnitude of the star when the star is at 10 parsecs distance away from earth.

It is given that a star is 500 light-years away from earth moved to be 600 light years away. The value of absolute magnitude of the star does not changes. But the value of apparent magnitude changes with the distance. It would increase as the distance would increase. The star would appear less bright.

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A stone that is dropped freely from rest traveled half the total height in the last second. with what velocity will it strike th
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Answer:

hellooooo :) ur ans is 33.5 m/s

At time t, the displacement is h/2:

Δy = v₀ t + ½ at²

h/2 = 0 + ½ gt²

h = gt²

At time t+1, the displacement is h.

Δy = v₀ t + ½ at²

h = 0 + ½ g (t + 1)²

h = ½ g (t + 1)²

Set equal and solve for t:

gt² = ½ g (t + 1)²

2t² = (t + 1)²

2t² = t² + 2t + 1

t² − 2t = 1

t² − 2t + 1 = 2

(t − 1)² = 2

t − 1 = ±√2

t = 1 ± √2

Since t > 0, t = 1 + √2.  So t+1 = 2 + √2.

At that time, the speed is:

v = at + v₀

v = g (2 + √2) + 0

v = g (2 + √2)

If g = 9.8 m/s², v = 33.5 m/s.

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3 years ago
Please help me , I also have to show work on paper
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Answer:

Choose B

Explanation:

Hope Can I help you

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