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Homework Help: What is the rocket's initial upward acceleration?

  1. Mar 12, 2008 #1
    1. The problem statement, all variables and given/known data

    A 20000kg rocket has a rocket motor that generates 3E5 N of thrust.
    PartA:
    What is the rocket's initial upward acceleration? Express your answer using two significant figures.
    Part B:
    At an altitude of 5km the rocket's acceleration has increased to 6m/s^2. What mass of fuel has it burned? Use wo significant figures in your answer.

    2. Relevant equations
    Part A:
    I used the equation F_thrust_=ma-mg_earth_
    Part B:
    I dont' know the equation.


    3. The attempt at a solution
    PartA: I got the right answer 5.2 m/s^2
    Part B: I got it wrong i tried using the same equation as part A but didn't work.
     
  2. jcsd
  3. Mar 12, 2008 #2

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    It should have worked. The thrust is constant only m has changed. What did you get?
     
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