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!

Homework Help: Escape Velocity

  1. Oct 4, 2011 #1
    1. The problem statement, all variables and given/known data
    The acceleration of gravity on the surface of Mars is 0.38g. The radius of Mars is 2100 miles. Determine the velocity of a particle projected in a radial direction outward from Mars and acted upon by only the gravitational attraction of Mars by first modeling the motion into a differential equation and then solving the differential equation. Use your result to determine the velocity of escape from Mars.

    2. Relevant equations
    v^(2) = [2gR^(2) / r] + C

    3. The attempt at a solution
    g = 0.38
    r = 2100 miles
    R = ?
    I don't understand the differential equation part at all. I'm confused because I'm only given 2 variables...

    Any help is appreciated
  2. jcsd
  3. Oct 4, 2011 #2


    User Avatar

    Staff: Mentor

    Your differential equation should consist of an expression that relates the acceleration experienced by the projectile with the distance.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook