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I'm not sure where traction fits in to this...
think he means Tension.
Oh, I see. Well, what are your thoughts?
it's tension like @Algebraic! said
my thoughts are too despicable to be aired in this forum.
@RaphaelFilgueiras Do you think it goes forward or backward?
@Jemurray3 i know the answer
Oh, okay :) And @experimentX consider the acceleration as a gravitational field pointing towards the back of the car.
I was thinking that the baloon will experience backward with respect to the frame.|dw:1348770823195:dw|
Not quite. The air inside the car feels that acceleration too, and because it is heavier than the helium inside the balloon, the balloon actually feels a force toward the front.
Woops ... never considered that fact.
@Algebraic! that is true except the balloon goes to the front, not the back.
Clever problem indeed!!
the answer is c)
Walter Lewin actually does a demonstration of this effect in his 8.01 course, if you want to see it for yourself.
I think I remember seeing it, actually. I just don't remember the logic.
the ballon will suffer a aparent g in gap direction
the buyont force will be in same direction of gap
helium is tricky gas. should have noted.
pressure differential. well, I feel dumb. http://www.youtube.com/watch?v=Vi8t0x6zZNY&feature=player_detailpage#t=1524s
haven't taken this course yet. is it first year mechanics?
It's not calc. based year one physics?