Thrust of a Rocket: Calculating Force

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The discussion focuses on calculating the thrust of a rocket using the formula F = ma, where the user attempts to derive acceleration and force based on given values. The user estimates gravity as 10 m/s² and calculates time and velocity, but expresses uncertainty about their results and the correctness of their approach. They arrive at a force of 0.1219 N, which they find confusing. The user acknowledges their lack of experience in physics and seeks clarification on how long the thrust lasts. Overall, the thread highlights the challenges faced by beginners in applying Newton's Laws to real-world problems.
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Homework Statement



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

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 .)

Homework Equations



No idea...

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.
 
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How long does the thrust last?
 
Spinnor said:
How long does the thrust last?

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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