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: 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)
    So,

    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...
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...