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VikaD [51]
3 years ago
15

Which of these would be a good model to demonstrate the fact that the galaxies are moving apart as the universe is expanding?

Physics
1 answer:
Sergio [31]3 years ago
3 0

Answer: Option A: The spots on the balloon move away as the balloon is inflated.

one of the scientific models describes the galaxies are moving apart as the universe is expanding. This expansion theory came from the observation of red-shifted spectrum from all the directions indicating that the galaxies are moving away.  This can be understood from the inflated balloon. Initially spots can be marked using a colored pen on the balloon.On inflating the balloon, it would be noticed that the spots on the balloon move away. Actually the position of the spots won't change, but the distance between the spots would expand. This is a good model to explain the expanding universe. The galaxies are neither moving in any random direction nor moving forward. So, rest of the options are not good models to explain the theory.

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he number of hydrogen ions would equal the number of hydroxide ions in a solution with a pH of _____.
erma4kov [3.2K]

The number of hydrogen ions would equal the number of hydroxide ions in a solution with a pH of 7.

<u>Explanation :</u>

The substance’s acidic or basic nature is determined by its pH value which is the indication of the number of free hydrogen ion (H^{+}). The pH value and the alkalinity can be measured by pH scale which varies from 0 to 14. Neutral water has the pH value of 7 with equal number of hydrogen ions (H^{+}) and Hydroxide ions (O H^{-}).

A substance with a pH value above than 7 is counted amongst the base whereas those with a pH value are counted amongst the acids. When a solution gets ten times more acidic, the pH value falls by the count of one.  

There are various methods to determine the pH value of any substance and the most effective and quick one is the pH indicator paper. When the indicator paper is dipped in the water solution of the substance, it colour changes according to the different pH value. Another effective method to determine the pH value is the use of pH electrodes.

6 0
4 years ago
How do you find weight =mass×gravitational acceleration
Artist 52 [7]
That's a formula that shows the relationship between three quantities ...
weight, mass, and acceleration.  If you know any two of them, then you
can use this formula to find the one you don't know.

Examples:

==>  I have a rock with 2 kilograms of mass.
        The gravitational acceleration on Earth is 9.8 m/s² .
        How much does my rock weigh on Earth ?

         Weight = (mass) x (grav acceleration)
                      = (2 kg) x (9.8 m/s²)
                                                       =  19.6 newtons
                                                  (about 4.41 pounds)

==>  My brother weighs 770 newtons (about 173 pounds) on Earth.
         What is his mass ?

                               Weight = (mass) x (grav acceleration)

                               770 newtons = (mass) x (9.8 m/s²)
Divide each side
by 9.8 m/s²:           770 newtons / 9.8 m/s² = mass

                                        78.57 kilograms = mass

==> When I went to the Moon, I took along my 2-kilogram rock.
         I weighed my rock on the Moon. 
         It weighs 3.25 newtons  (about 0.73 pound) there.
         What is the gravitational acceleration on the Moon ?

                                   Weight = (mass) x (grav acceleration)

                                   3.25 newtons = (2 kg) x (acceleration)

Divide each side
by  2 kilograms:        (3.25 newtons)/(2 kg)  =  acceleration

                                    1.63 m/s² = grav acceleration on the Moon 

          


7 0
3 years ago
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Nat2105 [25]
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7 0
4 years ago
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HURRY ! THE BEST I WILL GIVE THE BRAINLIEST​
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6 0
3 years ago
Why is the earth called the miracle planet?
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Because a lot of things only live on earth earth is a place where all living this can live in
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