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: Force exerted. Please help

  1. Sep 26, 2006 #1
    force exerted........ Please help

    An astronaut who weighs 798 N on the surface of the earth lifts off from planet Zuton in space ship. The free fall acceleration on Zuton in 8.8 m/s2. At the moment of lift off the space ship experiances an acceleration gravity of 8.9 m/s2.
    What is the magnitude of the force that the space ship exerts on the astronaut? Answer in units of N.

    Please help me
  2. jcsd
  3. Sep 27, 2006 #2


    User Avatar

    Staff: Mentor

    The question is not stated very well in terms of the extra force from the rocket acceleration, but whatever. Can you tell us how much the person weighed on Zuton before the ship took off? And how much force does the acceleration of takeoff add? What is the total?
  4. Sep 27, 2006 #3
    Well since the Astronaut's mass is 798 / 9.8 which equals 81.43, shouldn't his weight on Zuton be 81.43 * 8.8 which equals 716.58? Not sure if that helps much :p
  5. Sep 14, 2008 #4
    Re: force exerted........ Please help

    I have the same problem as above with slightly different numbers...
    The mass of the astronaut ends up being 74.1 in my problem (he weighs 726.6N on Earth)
    Gravity on Zuton=7.8m/s2
    The ship accelerates at a speed of 9.1m/s
    I've tried to plug in numbers in newton's 2nd law and still can't seem to come up with the correct answer. I figured that gravity and the ships 'a' must be part of the equation at some point but i can't seem to figure out how they fit.
    Please help?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook