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shreya_ajoshi:
Hi!
How do you do this question?
1a) A rocket has a mass of 400kg. 75% being fuel. It develops a thrust of 8000N. Calculate its initial acceleration

Thank you!!! :)

RuiAce:

--- Quote from: shreya_ajoshi on December 26, 2016, 02:04:35 pm ---Hi!
How do you do this question?
1a) A rocket has a mass of 400kg. 75% being fuel. It develops a thrust of 8000N. Calculate its initial acceleration

Thank you!!! :)

--- End quote ---

kiwiberry:
wait, does the net force on the rocket need to include the weight force as well?

so Fnet = ma
T - mg = ma
a = (T-mg)/m
= ( 8000-400x9.8 )/400
= 10.2 ms^-2

RuiAce:
Oh, no wonder I got a weird result. I can't do simple arithmetic.

shreya_ajoshi:
Thank you!!
So the '75% being fuel" has nothing to do with the question?

(Answer: Yes)

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