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Homework Help: Thrust of a rocket.

  1. Sep 11, 2011 #1
    1. The problem statement, all variables and given/known data

    [PLAIN]http://img714.imageshack.us/img714/8184/rocketj.png [Broken]

    I am not sure if the problem has enough information to find. However, i tried some of the works.
    g=10m/s2( i use gravity as 10 .)

    2. Relevant equations

    No idea...

    3. The attempt at a solution

    I am thinking this formula F = ma to find the thrust.

    so my first plan is to find the a(in xy direction) and then get the Force. (not sure if this is a right attempt)

    t=(2(275)/10) = 7.4 sec

    V(in y dir) = (2(275)(10))^.5 = 74m/s
    V(in xy dir) = 74/sin(85) = 74m/s

    a(in xy dir)= 74/(7.4*2) =5.3m/s2 (I am pretty sure this part is wrong)

    F = ma
    F= (26/1000)kg * 5.3 m/s2 = 0.1219 N (o_O Doesn't make sense lol )

    I am new to Physics. So, yea, i am still confusing with some stuffs. Thanks in advanced for helping me.
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Sep 11, 2011 #2
    How long does the thrust last?
  4. Sep 11, 2011 #3
    I am srry. I don't have the information..
    P.S i just learned Newton's Laws. So ye, i don't know much of physics yet...
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