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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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If potential energy is at point A is 12 joules, what is the potential energy at B ?
deff fn [24]

Answer:

incomplete information

Explanation:

Where is diagram? no point A and point B given

7 0
3 years ago
Solar cells convert what type of energy into electrical energy?
zysi [14]
I think the correct answer from the choices listed above is option D. Solar cells convert electromagnetic energy into electrical energy. This is because the photons from the rays of light are electromagnetic waves or particles. Hope this answers the question.
6 0
4 years ago
Read 2 more answers
You place an object 30.0 cm from a concave mirror of 15.0 cm focal length. The object is 1.8 cm tall. Find the image position an
Softa [21]

Answer:30 cm

Explanation:

Given

object distance u=30\ cm

focal length of concave mirror f=15\ cm

height of object h_o=1.8\ cm

Using mirror formula

\Rightarrow \frac{1}{v}+\frac{1}{u}=\frac{1}{f}

\Rightarrow \frac{1}{v}=\frac{1}{15}-\frac{1}{30}

\Rightarrow \frac{1}{v}=\frac{2-1}{30}

\Rightarrow v=30\ cm

and magnification is

\Rightarrow m=\frac{-v}{u}=\frac{h_i}{h_o}

\Rightarrow \frac{-30}{30}=\frac{h_i}{1.8}

\Rightarrow h_i=-1.8\ cm

So height of object is same as of object .

Position :image is formed at the spot where object is placed.

4 0
3 years ago
The salinity of the oceans has been relatively constant throughout geologic time because salt is removed at the same rate at whi
tia_tia [17]

True

Explanation:

It is correct to say that the salinity of the oceans has been relatively constant throughout geologic time because salt is removed at the same rate it has been added.

Salinity is the amount of dissolved salt found in the ocean. It is the degree of saltiness of the ocean.

  • The rate at which salt has been added into the ocean over the years through geologic time has been very constant.
  • Most salts in the ocean comes from land.
  • Also the rate it has been removed is fairly constant.
  • The salinity of ocean has once been used to date the age of the earth.

learn more:

Salinity brainly.com/question/10491444

#learnwithBrainly

5 0
3 years ago
We have compared the Terrestrial Planets and the Giant or Jovian Planets, but when we look at the 4 Giant Planets we can see tha
Ksivusya [100]

Answer:

i. Magnetic fields

ii. All 4 planets in appearance have deeper atmospheres and darker cloud.

iii. All the 4 Jovian planets rotates very quickly, with a range of 10 to 17 hours.

Explanation:

The Jovian planets is different from terrestrial planets in so many ways. The Jovian planets includes Jupiter , Saturn, Uranus and Neptune.

The major similarities shared by all of these 4 planets includes

i. Magnetic fields: Each of this Jovian planets have a strong magnetic field and are generated by electric currents in its rapidly sniping interior. The magnetosphere which is the region at which the planet magnetic field dominates is far more stronger in Jupiter than other Jovian planets . Although the magnetic field of Saturn , Neptune and Uranus works in similar way to Jupiter  but are less stronger.

ii. All 4 planets in appearance have deeper atmospheres and darker cloud. The  uppermost clouds of Jupiter and Saturn has more of ammonia crystals .The upper cloud of Neptune is composed of methane, The cloud of  Uranus is deep.  

iii. All the 4 Jovian planets rotates very quickly, with a range of 10 to 17 hours. The rotation period of Jupiter is the shortest among the Jovian planets which is around 9 hours 55 minutes. The rotation period of Neptune and Uranus take longer time than the other 2 Jovian planets( a little above 17 hours).

4 0
4 years ago
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