Keplers third law I understand.

T^2/a^3 of one planet = T^2/a^3 second planet.

But I can't do the algebra to solve for the second planet's a^3 (semimajor axis)

Would someone walk me through the steps please? Thanks.

  1. 👍 0
  2. 👎 0
  3. 👁 143
  1. a2^3= (T2/t1)^2 * a1^3

    where a2 is the semimajor axis of the second planet.

    1. 👍 0
    2. 👎 0
  2. Thanks

    1. 👍 0
    2. 👎 0
    posted by charlie

Respond to this Question

First Name

Your Response

Similar Questions

  1. Astronomy

    Suppose that, in the future, observations with some new telescope reveal a planet about 16 AU from a star whose mass is the same as our sun's mass. How long does it take the planet to orbit the star? Use Keplers law. You know at

    asked by Roger on April 3, 2007
  2. help help help

    The asteroid belt between Mars and Jupiter consists of many fragments (which some space scientists think came from a planet that once orbited the Sun but was destroyed). (a) If the center of mass of the asteroid belt is about 2

    asked by Teri D on October 9, 2006
  3. Physics - weighing a planet

    Explain how you can weigh a planet? ( Is it by the combination of the netwons law of univeral gravitation and keplers third law; t^2/r^3 = 4(pi)^2/G(Msun) )

    asked by Shaila on August 22, 2010
  4. space

    Keplers second law notes that a planet should move fastes at aphelion. true or false

    asked by Jo on January 27, 2009

    On some planet with a radius of 8,553 km and a mass of 5.55 x 1024 kg the planet is spinning so fast such that anything at the equator will fly off of the planet. What is the planet's period (length of a day on the planet) in

    asked by Amanda on October 27, 2011
  6. Physics

    At planet X, there is another planet called Y about 34 million light years away. The radius of planet X is 1 * 10^9 m. How far away from the center of the planet X is the planet Y in meters?

    asked by Scoop on October 30, 2012
  7. science

    if all of the following imaginary planets were the same distance from the sun, which would experience the strongest force of gravity due to the sun? planet a: mass 3,500 kg planet b: mass 50,000 kg planet c: mass 750 kg planet d:

    asked by victoria on October 29, 2013
  8. Astrophysics

    I'm having trouble understanding the formulas for determining a planet's distance and mass. A planet's distance is related to the period of revolution and the mass of the central star (e.g, the sun). The relationship is called

    asked by Judy on September 18, 2006
  9. physics

    An object rests on the surface of planet y. Its mass is unknown. Find the acceleration due to gravity near the surface of planet y. Answer in m/s/s. G=6.673x10^-23 radius of planet y=2439700m mass of planet y=3.302x10^23kg radius

    asked by camille on April 10, 2011
  10. Physics

    A planet has two satellite moons. Moon X has an orbital period of 2.13 days. Moon Y has an orbital period of about 3.53 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite

    asked by Angelina on February 23, 2012

More Similar Questions