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Force Problem (Rocket Launch)

  1. Mar 8, 2010 #1
    1. The problem statement, all variables and given/known data
    A Saturn-Apollo rocket has a mass of 5.40 x 105kg. What is the initial acceleration of the rocket if the thrust at lift off is 7.40 x 106 N?
    How high will the rocket rise one minute after launch?

    2. Relevant equations
    Fg=mg
    FNET=ma


    3. The attempt at a solution
    I used Fg=mg, plugging in 5.5 x 105 for m and 9.8 for g to get Fg=5.292 x 106 N.
    I then used the FNET equation as so:
    7.4 x 106-5.292 x 106=(5.4 x 105)(a)
    And my answer was an acceleration of 3.89m/s2.
    For the second question I got that the rocket would reach 233.4m one minute after launch.
    Is this correct or how is this done correctly? Thanks!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 8, 2010 #2

    rock.freak667

    User Avatar
    Homework Helper

    Your method is correct, but you did the operations wrong I believe. The thrust after lift off is the resultant force. So you need to add that to the weight and then get the acceleration.
     
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