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✳✴Hopefully this will help you!!✳✴
❄<u>Edwin Hubble made many important contributions to astronomy. Up until his observations in 1922, scientists were of the opinion that the universe consisted of only one galaxy: the Milky Way. Hubble's observations of Cepheids and subsequent measurement of their distances (using Henrietta Swan Leavitt's calculations) showed that many celestial objects were too far away to be part of the Milky Way and were actually galaxies themselves.❄</u>
<u>❄By calculating the distances to many newly found galaxies, Hubble also discovered that the galaxies were receding away from Earth and that the speed of recession was proportional to the distance. This established the fact that the universe was expanding, which changed the entire consensus (from the time of Newton) that the universe was finite. It also backed up Georges Lemaître's theory that the universe had a beginning (later called the Big Bang).❄</u>
<u>incorrect Answers:</u>
A̶. H̶e̶ ̶d̶i̶s̶c̶o̶v̶e̶r̶e̶d̶ ̶v̶a̶r̶i̶a̶b̶l̶e̶ ̶s̶t̶a̶r̶s̶.
B. H̶e̶ ̶p̶r̶o̶v̶e̶d̶ ̶t̶h̶a̶t̶ ̶t̶h̶e̶ ̶h̶e̶l̶i̶o̶c̶e̶n̶t̶r̶i̶c̶ ̶m̶o̶d̶e̶l̶ ̶a̶c̶c̶u̶r̶a̶t̶e̶l̶y̶ ̶d̶e̶s̶c̶r̶i̶b̶e̶d̶ ̶o̶u̶r̶ ̶s̶o̶l̶a̶r̶ ̶s̶y̶s̶t̶e̶m̶.
C. H̶e̶ ̶f̶o̶u̶n̶d̶ ̶a̶ ̶r̶e̶l̶a̶t̶i̶o̶n̶s̶h̶i̶p̶ ̶b̶e̶t̶w̶e̶e̶n̶ ̶t̶h̶e̶ ̶p̶e̶r̶i̶o̶d̶ ̶l̶u̶m̶i̶n̶o̶s̶i̶t̶y̶ ̶a̶n̶d̶ ̶d̶i̶s̶t̶a̶n̶c̶e̶ ̶o̶f̶ ̶s̶t̶a̶r̶s̶.
D. H̶e̶ ̶p̶r̶o̶v̶e̶d̶ ̶t̶h̶a̶t̶ ̶t̶h̶e̶ ̶u̶n̶i̶v̶e̶r̶s̶e̶ ̶i̶s̶ ̶f̶i̶n̶i̶t̶e̶.
<u>Answer:</u>
⭕E. He discovered that the universe was expanding.
Hi, thank you for posting your question here at Brainly.
In order to answer this question, you must have data for the electricity cost. For this example let's follow the electricity cost for USA. According to U.S Energy Information Administration, the an average home costs 12.3 cents per kW-h in January 2017. For consistency, convert year to hours. In a year (365 days), there are 8769 hours.
12.3 cents/kW-h * 0.5 kW * 8769 h = 53929.35 cents = $539.2935
<span>
1 . when will the fare reach that height:</span>
<span>The ascending and descending time are equal but let's show
it: set the h = 0 </span>
<span>
1500t - 16t^2 = 0 => solve the quadratic </span>
<span>
t = 0 => reject </span>
<span>
t = 375/4 seconds => period to hit the ground, notice that this is twice the
time to reach max h. </span>
2. If the plane … solution:
<span>d = vt </span>
<span>
t = d/v </span>
<span>
= 50,000/880 </span>
<span>
It is approximately 56.8 sec to reach the flare but the flare reached max h at
375/8 ≈ 46.9 sec, so it won't hit the plane going up, but will it hit the plane
on its way down from 35,156.25 ft.</span>
Did the question come with examples? If so, you might want to add those so others can answer! (:
