Math Problem Statement

A satellite orbits the sun with a period of 2.00 days. What is the radius of its orbit? Express your answer with the appropriate units.

Solution

To solve for the radius of the satellite's orbit around the Sun, we can use Kepler's Third Law of Planetary Motion, which relates the orbital period of a satellite to the radius of its orbit around the Sun. Kepler's Third Law is given by:

T2=4π2GMr3T^2 = \frac{4\pi^2}{GM_{\odot}}r^3

Where:

  • TT is the orbital period of the satellite (in seconds),
  • GG is the gravitational constant (6.674×1011m3kg1s26.674 \times 10^{-11} \, \text{m}^3\text{kg}^{-1}\text{s}^{-2}),
  • MM_{\odot} is the mass of the Sun (1.989×1030kg1.989 \times 10^{30} \, \text{kg}),
  • rr is the radius of the orbit (which we want to find).

We can rearrange the equation to solve for rr:

r3=GMT24π2r^3 = \frac{GMT^2}{4\pi^2}

Step 1: Convert the orbital period TT to seconds.

Given that the period TT is 2.00 days, we need to convert this to seconds:

T=2.00days×24hours/day×3600seconds/hourT = 2.00 \, \text{days} \times 24 \, \text{hours/day} \times 3600 \, \text{seconds/hour} T=2.00×86400s=172800sT = 2.00 \times 86400 \, \text{s} = 172800 \, \text{s}

Step 2: Substitute known values into the equation.

Now, substitute T=172800sT = 172800 \, \text{s}, G=6.674×1011m3kg1s2G = 6.674 \times 10^{-11} \, \text{m}^3\text{kg}^{-1}\text{s}^{-2}, and M=1.989×1030kgM_{\odot} = 1.989 \times 10^{30} \, \text{kg} into the rearranged Kepler's Third Law:

r3=(6.674×1011)(1.989×1030)(172800)24π2r^3 = \frac{(6.674 \times 10^{-11})(1.989 \times 10^{30})(172800)^2}{4\pi^2}

Step 3: Calculate the value of rr.

Let's compute this value.The radius of the satellite's orbit around the Sun is approximately 4.65×1094.65 \times 10^9 meters, or 4.65 million kilometers.

Would you like more details or have any questions?

Here are 5 related questions to expand on this concept:

  1. How would the radius change if the satellite's period was 5 days instead of 2 days?
  2. How is Kepler's Third Law applied to objects orbiting planets like Earth?
  3. How does the mass of the central object (the Sun in this case) affect the orbit of a satellite?
  4. What assumptions are made in Kepler’s Laws about the shapes of orbits?
  5. How does the gravitational force between two objects depend on their distance?

Tip: The orbital period and the radius of an orbit are strongly related. Increasing the orbital period significantly increases the orbital radius due to the cubic relationship in Kepler's Third Law.

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Math Problem Analysis

Mathematical Concepts

Orbital Mechanics
Kepler's Third Law
Exponential and Cubic Relationships

Formulas

T^2 = (4π^2 / GM) * r^3
r^3 = (GMT^2) / (4π^2)

Theorems

Kepler's Third Law

Suitable Grade Level

Grades 11-12, College Level Physics