Thrust of a Rocket: Calculating Force

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SUMMARY

The discussion focuses on calculating the thrust of a rocket using Newton's second law, represented by the formula F = ma. The user attempts to determine the acceleration in the xy direction and subsequently the force, using gravity as 10 m/s². Despite their calculations, including a thrust duration of 7.4 seconds and an acceleration of 5.3 m/s², the user expresses confusion regarding the results, indicating a need for further clarification on thrust duration and the application of Newton's Laws.

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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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