1Ans c yes she wld move backwards.it is b'coz due to zero gravity the astronaut is in the position of weightlessnes so if she throws anything with some force she wld move bk with the sm force
1a) The boat should not move since the fan provides an internal force. Internal forces are not taken into account for external work done. So no movt.
b) Not sure, but I think there would be a really small displacement, just till the two magnets come in contact.
c) The above answer seems right.
d) Shouldn't she move forward?
1Oh wait, the last one, I didn't see the pic. I can't see any source of a reaction force to the gas ejected, so I don't think she will move.
