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Hi! I really need help with the following please:

The planets in our solar system do not travel in circular paths. Rather, their orbits are elliptical. The Sun is located at a focus of the ellipse.

The perihelion is the point in a planet’s orbit that is closest to the Sun. So, it is the endpoint of the major axis that is closest to the Sun.

The aphelion is the point in the planet’s orbit that is furthest from the Sun. So, it is the endpoint of the major axis that is furthest from the Sun.

The closest Mercury comes to the Sun is about 46 million miles. The farthest Mercury travels from the Sun is about 70 million miles.

(Score for Question 1: ___ of 3 points)
What is the distance between the perihelion and the aphelion?

(Score for Question 2: ___ of 5 points)
What is the distance from the center of Mercury’s elliptical orbit and the Sun?

(Score for Question 3: ___ of 8 points)
Write the equation of the elliptical orbit of Mercury, where the major axis runs horizontally. Allow a and b to be measured in millions of miles. Use the origin as the center of the ellipse.

(Score for Question 4: ___ of 2 points)
What is the eccentricity of the ellipse? Round your answer to the nearest thousandth.

(Score for Question 5: ___ of 2 points)
What does the value of the eccentricity tell you about the relative shape of the ellipse?

Thank you very much in advance!

Daniel.

Nov 17, 2019
edited by Guest  Nov 17, 2019

#1
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Looks like you are doing a test right now.

Chris if you want to answer these could you please leave it for a couple of hours.

Nov 17, 2019
#2
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That's fine if you can help me later, thank you so much

Guest Nov 17, 2019
#3
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I am not good with conics so I probably will not attempt to help anyway .

But if I was to help I would want you to spell out what you had tried in order to help yourself first.

Nov 17, 2019
#4
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OS first I drew a visual representation of it to get a better picture of what I'm working with. But from then on I am unsure as to what I should do...

Guest Nov 17, 2019
#6
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I just drew it and the answer to the first question is staring me in the face.

Melody  Nov 17, 2019
#5
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Sorry to interrupt-

Is this SCIENCE???

Nov 17, 2019
#7
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Yes and it is maths too.

Melody  Nov 17, 2019
#8
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Okay, nvm, it's conics...

And this very suspiciously looks like homework...

tommarvoloriddle  Nov 17, 2019
#9
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conics and math

idk the points are just staring at me in the face...

tommarvoloriddle  Nov 17, 2019
edited by tommarvoloriddle  Nov 17, 2019
#10
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I think it looks like a test or something that is worth marks.

Melody  Nov 17, 2019
#11
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Oh.

Got it!

Nov 17, 2019
#12
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1)  What is the distance between the perihelion and the aphelion?

70 +  46   =   116  million miles

2) What is the distance from the center of Mercury’s elliptical orbit and the Sun?

The major axis  is 116 million miles

This  =  2a

So

2a  = 116

a  =  58

This is the distance from the center of the ellipse to one endpoint on the major axis

And  c  = the distance from the center of its elliptical orbit to the Sun   =  58 - 46  = 12 million miles

3) Write the equation of the elliptical orbit of Mercury, where the major axis runs horizontally. Allow a and b to be measured in millions of miles. Use the origin as the center of the ellipse.

b  = sqrt [ 58^2 - 12^2]  =  sqrt (3220)

b^2  = 3220

a^2  = 58^2  = 3364

The equation is

x^2                y^2

____   +       ____  =      1

3364             3220

4)  Eccentricity   =  c/a =  12 /   58    ≈   .207

5)   The closer to 0 the eccentrcity is,   the more circular the ellipse....the nearer to 1, the more elongated

Thus.....the elliptical  path here is somewhat circular

Here's a graph :   https://www.desmos.com/calculator/cj4ey4e2gx   Nov 17, 2019
#14
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i have anothe rquestion, wouldn't the answer for the first one be 70-46?

Guest Nov 17, 2019
#15
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No

Imagine the  focus is the Sun

The nearest that Mercury is to the Sun is 46 million miles....this is the distance  a - c

The farthest that Mercury is to the Sun is 70 million miles....this is the distance a + c

So  adding these distances we have  (a - c) + (a + c)  =  2a  =  the length of the major axis =116 million miles   CPhill  Nov 18, 2019
#16
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I am sure the kid learned a lot from your answer Chris.....   NOT

Melody  Nov 18, 2019