On average The number of trains after a long time is = 2 trains
<u>Given data :</u>
Number of trains = 3
<u>Let's assume :</u>
speed of Train 1 = V₁
speed of Train 2 = V₂
speed of Train 3 = V₃
<h3> </h3><h3> Determine the number of trains after a long time has elapsed </h3>
- Before linkage = 3 trains
- When ( Train 1 and Train 2 links ) = 2 trains
- When ( Train 1 , Train 2 and Train 3 links ) = 1 train
- When ( Train 2 and Train 3 links ) = 2 trains
Therefore the average number of trains after a long time will be
( 3 + 2 + 1 + 2 ) / 4
= 8 / 4
= 2 trains
Hence we can conclude that On average The number of trains after a long time is = 2 trains
Learn more about Average calculations : brainly.com/question/20118982
The amount of grams of hydrogen that are in the water sample is;
3.985 g
<h3>Avogadro's number</h3>
We are given that;
Number of moles of oxygen in a sample of water = 12 × 10²³
- Now, the chemical formula of a molecule of water is H₂O. This means that for every 1 atom or molecule of oxygen, there must be 2 hydrogen atoms or molecules present.
Since Number of moles of oxygen in the sample is 12 × 10²³, then number of moles of hydrogen will be twice that = 2 × 12 × 10²³ = 24 × 10²³ moles
Now, molar mass of hydrogen is 1 g/mol and we know that;
Molar mass = Avogadro's number(6.023 × 10²³) moles
Thus;
6.023 × 10²³ moles = 1 g/mol
Thus; 24 × 10²³ moles of hydrogen = ( 24 × 10²³ × 1)/(6.023 × 10²³)
⇒ 3.985 g
Read more on Avogadro's number at; brainly.com/question/914267
Sunspots appear dark in pictures of the Sun as they actually are fairly bright but appear dark against the even brighter background of the surrounding Sun. Thus, the correct option for this question is A.
<h3>What are Sunspots?</h3>
Sunspots may be defined as areas that appear dark on the surface of the Sun. They appear dark because they are cooler than other parts of the Sun's surface. Solar flares are sudden explosions of energy caused by tangling, crossing, or reorganizing magnetic field lines near sunspots.
According to the context of this question, sunspots are blotches on the sun that appear dark because they are cooler than the rest of the solar surface.
Astronomers do know they are linked to intense magnetic activity on the sun, which can suppress the flow of hot matter, but much about their structure and behavior remains enigmatic.
Therefore, the correct option for this question is A.
To learn more about Sunspots, refer to the link:
brainly.com/question/17783575
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Answer:
because we are smart and use the internete
Explanation: