IIT JEE , AIEEE Forum - Physics , Mechanics - DAMN THIS IS SIMPLY NOT POSSIBLE!!!!!!!!!!!!!!!!!!!!!!!!!!!

riku

Boss,,i mean eshaan, in space,, u cant consider gravity, and if u do so,, then according to ur statement u r making net force zero..

And yes,, in space(gravity free),,if gases are burnt then they will eject out to create force on the system(rocket),, and create acceleration,, constant speed itself refers zero acc...
For,, ultimator, the statement given by him,, states the hand to exert the balancing force ,, the force that balances the frictional force and hand moves with nearly const. vel.,,, again net force zero... Otherwise , if u would keep ur hand on table,, it will move without any mechanical work,,hahaha..

Gettin on serious notes,, yes mindfreak is rite... there is no net force that can create zero acc.(in this case)!!
But if machinery is such that it somehow stores burnt gases,, and if certainly burning of gases stop, and certain nozzle is opened,, due to pressure diff., the gases move out.. But still there will be many practical factors to be considered... I hope u got it.. Rate quickly!! Take care..

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