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kykrilka [37]
3 years ago
15

Which of the following statements about galaxies is true? A. Galaxies typically contain millions of stars. B. Galaxies actually

contain very few stars. C. Galaxies typically contain thousands of stars. D. Galaxies typically contain billions of stars.
Physics
2 answers:
Sloan [31]3 years ago
6 0

the answer is D i took the quiz so it is definitely D  

const2013 [10]3 years ago
6 0

Answer:

D. Galaxies typically contain billions of stars.

Explanation:

A galacy on average contains from 150-250 billion up to 100 trillion of starts, for example the milky way has aproximately 200 billion stars, there are for example andromeda galaxy has approximately 1 trillion stars but the largest observable and found galaxy in the universe is IC1101 has a mass of 100 trillion stars and this is only what we have been able to observe.

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2 years ago
A hot air balloon of total mass M (including passengers and luggage) is moving with a downward acceleration of magnitude a. As i
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Answer:

When balloon moves in the downward direction two forces acts on it.  

    i) Force exerted by air in the upward direction  

    ii) Weight  

According to newton’s second law of motion:  

      Sum of forces = Ma  

                W – F = Ma  

               Mg – F = Ma     …….. (i)  

when some of the mass m is dropped and balloon is moving in upward direction with acceleration a/2 then,  

               F – W = (M-m)a/2

               F – (M-m)g = (M-m)a/2

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Adding equation (i) and (ii)  

              mg = M(3a/2) – ma/2

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