<em>The correct option is</em> D. The initial momentum of the blue and green train combined during the collision is 200 kgm/s.
<h3>
Initial momentum of the blue and green train</h3>
Apply the principle of conservation of linear momentum as follows;
Pi = m1v1 + m2v2
where;
- m1 is mass of blue train
- m2 is mass of green train
- v1 is velocity of blue train
- v2 is velocity green train
- Pi is the initial momentum of the two trains
Pi = (50 x 4) + 30(0)
Pi = 200 kgm/s
Thus, the initial momentum of the blue and green train combined is 200 kgm/s.
Learn more about momentum here: brainly.com/question/7538238
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Answer:
2 a) it is less dense than the water
2 b) it is more dense than the water
3 a ping pong ball is hollow and less dense than the water so it quickly bounces up to the surface of the water
Answer:
Hi there! I have only the procedure and the scientific names of the creatures. Hope this helps!
Procedure
I studied the physical features of ten creatures and classified them using the key. I completed each section below and recorded the creature's scientific name in the data section.
The Creatures Scientific Names:
1
Fuzzus tallywag
2
Fuzzus pointilus
3
Silkus duosquirmus
4
Fuzzus chompilus
5
Silkus stretchilus
6
Silkus tallyhas
7
Fuzzus feelzalot
8
Silkus monosquirmus
9
Fuzzus squarilus
10
Silkus monowrestle
Have a thrilling Thursday!
~Lola
The discovery of gallium was significant as it confirmed Mendeleev’s predictions and showed the usefulness of his table.
Answer: Option First
<u>Explanation:
</u>
In 1871, Mendeleev prepared a periodic table of all known elements to study their properties. While making the table, he left some places in the table for elements that were yet to be discovered. One of the elements was eka-aluminium.
In 1875, a French scientist Paul Emile Francois Lecoq de Boisbaudran discovered a new element spectroscopically in the course of examining zinc blende. This newly discovered element showed the same properties as predicted by Mendeleev for the eka-aluminium with an atomic weight 69.
Later, the specific gravity of the element was also found to be the same as predicted by Mendeleev i.e. 5.9. After this, Lepoq named the element as Gallium, which confirmed Mendeleev’s predictions and made his periodic table worthier.