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a_sh-v [17]
3 years ago
5

Question 4 of 18 This is an excerpt from the website World War I by high school student Alexia Dengbai World War I may not have

ended all wars that would come later, but at the time, it was one of the deadliest conflicts in history. An estimated 15 million soldiers and civilians were killed in the war. New warfare technologies, like armored tanks and airplanes, added to the death and destruction of the war Which statement about the credibility of this source is most accurate? A This source is not credible because it contains more opinions than facts B. This source is credible because it contains opinions that are shared by other authors. C. This source is credible because it contains facts and information that are accurate D. This source is not credible because it was not written by an expert in the field PREVIOUS​
Social Studies
1 answer:
Sauron [17]3 years ago
6 0

Answer:

D.

Explanation:

In the given case, the credibility of this source can not be considered to be accurate. Though Alexia Dengbai has presented facts and information about the World War I, but it can not be considered to be accurate, the reason being author's credibility.

In the given case, the credibility of author comes in question. Alexia Dengbai is a high school student and not an excerpt in the field. Therefore, her opinions presented in the article can not be considered credible.

Therefore, the correct answer is option D.

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How fast must an object move before its length appears to be contracted to one-half its proper length?
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The object must move with the speed of \frac{\sqrt{3} }2} times to approximately seeing that it is contracted to exactly half of its actual length.

<h3>How is this calculated?</h3>

The length contraction experimented by the object as it approaches lightspeed, in meters per second, is described by Lorentz contraction formula:

\frac{L}{L'} = \sqrt{(1) - (\frac{v}{c})^{2}

Here, v is the current speed m/s

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\frac{L}{L'}= \frac{1}{2} and \frac{v}{c} = r then,

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To know more about the Lorentz contraction formula, visit:

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