Asked by Vanessa

What thrust is needed to give a 3.5*10^6 kg rocket carrying 1.8*10^6 Kg of cargo at an acceleration of 3.5m/s2?
Answered by bobpursley
acceleration=force/mass
force= 3.5*(3.5E6+1.8E6) N
Answered by Damon
F = m a

T-(5.3*10^8*9.81) = 5.3*10^8(3.5)
or
T = 5.3*10^8 * (9.81+3.5)
Answered by Vanessa
Thats the answer i had but my teacher stated that was incorrect
Answered by bobpursley
it depends on what your teacher assumes: is the rocket working on the surface of Earth upward (overcoming gravity), or in free space.
Answered by Vanessa
i believe free space. Im just really confused on how to do this
Answered by Vanessa
could there be any other answer to this?
Answered by bobpursley
free space, go with the answer I posted. On Earth, you have to subtract mg to get net force.
Answered by Vanessa
could you show me how you do it for on earth?
Answered by Vanessa
just not sure what you mean by subtract mg
Answered by Damon
I did it for on earth. Bobpursley did it for in space with no gravity.
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