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Question: For each of the eight planets Mercury to Neptune, the semi-major axis of their orbit and their orbital period are as follows:

(a) Explain why these values, when plotted as T2 versus a3, fall close to a straight line. Which of Kepler鈥檚 laws is being tested? However, the values of and cover such a wide range that this plot is not a very practical way to graph the data. (Try it.) Instead, plot log (with in seconds) versus log (with in meters). Explain why the data should also fall close to a straight line in such a plot. (b) According to Kepler鈥檚 laws, what should be the slope of your log versus log graph in part (a)? Does your graph have this slope? (c) Using G=6.67410-11Nm2/kg2, calculate the mass of the sun from the -intercept of your graph. How does your calculated value compare with the value given in Appendix F? (d) The only asteroid visible to the naked eye (and then only under ideal viewing conditions) is Vesta, which has an orbital period of 1325.4 days. What is the length of the semi-major axis of Vesta鈥檚 orbit? Where does this place Vesta鈥檚 orbit relative to the orbits of the eight major planets? Some scientists argue that Vesta should be called a minor planet rather than an asteroid.

Short Answer

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Answer

(a) As ,T2a3k the values fall close to a straight line.

The Kepler鈥檚 third law is being tested.

As ,LogTLoga that is one of the main reason the data should fall close to a straight line.

(b) The slope of the graph is 1.5 .

The graph has this slope which follows the second law of Kepler.

(c)The mass of the sun is 1.991030kg.

The calculated mass of the sun is equal to the value of the Appendix F.

(d) The length of the semi major axis is3.51011m .

The orbit of Vesta is between the orbit of Mars and also Jupiter.

Step by step solution

01

Identification of given data

The given data can be listed below as:

  • The semi major axis of Mercury is a1=57.9106km.
  • The orbital period of Mercury s is T1 = 88 Days.
  • The semi major axis of Venus is a2=108.2106km.
  • The orbital period of Venus is T2 = 224.7 Days. .
  • The semi major axis of Earth is a3=149.6106km.
  • The orbital period of Earth is .T3 = 365.2 Days.
  • The semi major axis of Mars isa4=277.9106km .
  • The orbital period of Mars is T4 = 687 Days. .
  • The semi major axis of Jupiter isa5=778.3106km .
  • The orbital period of Jupiter is T5 = 4331 Days. .
  • The semi major axis of Saturn is a6=1426.7106km.
  • The orbital period of Saturn is T6 = 10747 Days. .
  • The semi major axis of Uranus isa7=2870.7106km .
  • The orbital period of Uranus is .T7 = 30589 Days.
  • The semi major axis of Neptune is a8=4498.4106km.
  • The orbital period of Neptune is T8 = 59800 Days. .
02

Significance of the orbital period

The orbital period is referred to as the time which is required for completing one particular orbit of a planet. For an example, the orbital period of Earth is about 365 days.

03

(a) Determination of the reason the values fall in a straight line

The equation of the Kepler鈥檚 third law is expressed as:

T=2a32Gmsun

Here, Tis the orbital period of a particular planet, is the semi-major axis, is the gravitational constant and is the mass of the sun.

Squaring the both sides of the above equation, it can be represented as:

T2=42a3Gmsun

鈥(颈)

From the above equation, it can be identified that T2a3. This is the main reason the values fall close to a straight line.

Thus, as T2a3, the values fall close to a straight line.

It has been identified that the above answer has been gathered with the help of the Kepler鈥檚 third law.

Thus, the Kepler鈥檚 third law is being tested.

04

(a) Determination of the graph

The equation (i) has been recalled below:

T2=42a3GmsunT2a3=42Gmsun

Applying on the sides of the above equation.

LogT2a3=Log42GmsunLogT2-Loga3=Log42Gmsun2logT=3loga+Log42GmsunLogT=32loga+12Log42Gmsun

鈥(颈颈)

Substitute 6.6710-11Nm2/kg2for G and 1.991030kgfor in the above equation.

LogT=32loga+12log43.1426.6710-11Nm2/kg21.991030kg=32loga+12log49.85961.321020Nm2/kg=32loga+12log39.431.321020Nm2/kgLogT=32loga+12log2.9810-19kg/Nm2

According to the above equation, the graph of versus has been drawn below:

05

 Step 5: (a) Determination of the data gathered from the graph

As LogTLoga, that is one of the main reason the data should fall close to a straight line and it has also a straight line according to the graph.

Thus, as LogTLoga, that is one of the main reason the data should fall close to a straight line.

06

(b) Determination of the slope

The equation (ii) has been recalled below:

LogT=32loga+12Log42Gmsun

However, from the above diagram, it can be identified that the slope is 3/2 or 1.5.

Thus, the slope of the graph is 1.5 .

07

(b) Determination of the slope of the graph

With the help of trend line feature of excel, it can be identified that the graph of versus mainly shows the prediction of the second law of Kepler.

Thus, the graph has this slope which follows the second law of Kepler.

08

(c) Determination of the mass of the sun

The graph of the -intercept has been drawn below

According to the third law of Kepler,

12log42Gmsun=-9.2633-18.5266=log42Gmsun

Applying exponential on both sides of the above equation.

10-18.5266=10Log42Gmsun-18.5266=42Gmsunmsun=4210-18.5266G=43.14210-18.52666.6710-11

Hence, further as:

m=49.85862.9710-196.6710-11=49.85861.9810-29=39.431.9810-29=1.991030

Thus, the mass of the sun is1.991030kg .

09

(c) Determination of the comparison of the mass with Appendix F

The value in the appendix F is equal to the mass of the sun that is 1.991030kg.

Thus, the calculated mass of the sun is equal to the value of the Appendix F.

10

(d) Determination of the length of the semi-major axis

The equation of the length of the semi-major axis is expressed as:

a3=T2Gmsun2a=T2Gmsun23

Here, a is the length of the semi-major axis and T is the orbital period of Vesta鈥檚 orbit.

Substitute the values in the above equation.

a=114514560s26.6710-11Nm2/kg21.991030kg23.143=1.31016s21.321020Nm2/kg6.283=1.7161036Nm2s2/kg6.283=2.71035Nm2s2/kg3

Hence, further as:

a=2.71035Nm2s2/kg3=2.71035Nm2s2/kg1kgm/s21N3=2.71035kgm/s2m2s2/kg3=2.71035m33=3.51011m

Thus, the length of the semi major axis is 3.51011m.

11

(d) Determination of the place

According to the table given in the question, the orbit of Vesta is between the orbit of Mars and also Jupiter.

Thus, the orbit of Vesta is between the orbit of Mars and also Jupiter.

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