1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Launching a Rocket To mars help

  1. May 8, 2009 #1
    1. The problem statement, all variables and given/known data
    You are working on a project with NASA to launch a rocket to Mars, with the rocket blasting off from earth when earth and Mars are just aligned along a straight line from the sun. As a first step in doing the calculation, assume circular orbits for both planets. If Mars is now 60.1 degrees ahead of the earth in its orbit around the sun, when should you launch the rocket?

    Give your answer in days to the nearest whole number (i.e. 45.6 = 46)

    Note: For this problem you need to know the fact that all the planets orbit the sun in the same direction, and the year on Mars is 1.72 earth years.

    2. Relevant equations

    3. The attempt at a solution
    ok so first i used T=2pi/[tex]\omega[/tex] to find the [tex]\omega[/tex]'s of earth and mars using 2pi/T=[tex]\omega[/tex],
    I also converted the initial position of mars 60.1 degrees into radians, which is 1.049
    I then set both position equations of [tex]\theta[/tex](t)=.5[tex]\alpha[/tex]t2+[tex]\omega[/tex]ot+[tex]\theta[/tex] equal to each other and i got
    1.049=t(3.43E-7 - 1.99E-7) and then proceeded to take that answer, divide by 60 for minutes, divide by 60 again for hours, and divide by 24 for the number of days.
    The correct answer is 146, but i keept getting 84. What am i missing?

    EDIT: Nevermind, i found my mistake, thanks anway!
    Last edited: May 8, 2009
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted

Similar Discussions: Launching a Rocket To mars help
  1. Rocket Launch HELP (Replies: 1)

  2. Launching a rocket (Replies: 4)

  3. Rocket Launch (Replies: 1)

  4. Rocket launched (Replies: 2)

  5. Launched Rocket (Replies: 4)