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cool question.An helium ballon is fixed in a wagon floor with a massless thread,the wangon is completely closed.The thread stay in vertical position while train moves with contant velocity.If the train is accelarated forward ,we can say,in relation to the the train the ballon will:
a)move back and the tension in thread will increase
b)move back and the tension in thread not change
c)move forward and the tension in thread increase
d)move forward and the tension in thread not change
e)remains in vertical position
 one year ago
 one year ago
cool question.An helium ballon is fixed in a wagon floor with a massless thread,the wangon is completely closed.The thread stay in vertical position while train moves with contant velocity.If the train is accelarated forward ,we can say,in relation to the the train the ballon will: a)move back and the tension in thread will increase b)move back and the tension in thread not change c)move forward and the tension in thread increase d)move forward and the tension in thread not change e)remains in vertical position
 one year ago
 one year ago

This Question is Closed

RaphaelFilgueirasBest ResponseYou've already chosen the best response.0
dw:1348769313139:dw
 one year ago

Jemurray3Best ResponseYou've already chosen the best response.2
I'm not sure where traction fits in to this...
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.0
think he means Tension.
 one year ago

Jemurray3Best ResponseYou've already chosen the best response.2
Oh, I see. Well, what are your thoughts?
 one year ago

RaphaelFilgueirasBest ResponseYou've already chosen the best response.0
it's tension like @Algebraic! said
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.0
my thoughts are too despicable to be aired in this forum.
 one year ago

Jemurray3Best ResponseYou've already chosen the best response.2
@RaphaelFilgueiras Do you think it goes forward or backward?
 one year ago

experimentXBest ResponseYou've already chosen the best response.0
dw:1348770606550:dw
 one year ago

RaphaelFilgueirasBest ResponseYou've already chosen the best response.0
@Jemurray3 i know the answer
 one year ago

Jemurray3Best ResponseYou've already chosen the best response.2
Oh, okay :) And @experimentX consider the acceleration as a gravitational field pointing towards the back of the car.
 one year ago

experimentXBest ResponseYou've already chosen the best response.0
I was thinking that the baloon will experience backward with respect to the frame.dw:1348770823195:dw
 one year ago

Jemurray3Best ResponseYou've already chosen the best response.2
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.
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.0
dw:1348770974869:dw
 one year ago

experimentXBest ResponseYou've already chosen the best response.0
Woops ... never considered that fact.
 one year ago

Jemurray3Best ResponseYou've already chosen the best response.2
@Algebraic! that is true except the balloon goes to the front, not the back.
 one year ago

experimentXBest ResponseYou've already chosen the best response.0
Clever problem indeed!!
 one year ago

RaphaelFilgueirasBest ResponseYou've already chosen the best response.0
the answer is c)
 one year ago

RaphaelFilgueirasBest ResponseYou've already chosen the best response.0
dw:1348771067476:dw
 one year ago

Jemurray3Best ResponseYou've already chosen the best response.2
Walter Lewin actually does a demonstration of this effect in his 8.01 course, if you want to see it for yourself.
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.0
I think I remember seeing it, actually. I just don't remember the logic.
 one year ago

RaphaelFilgueirasBest ResponseYou've already chosen the best response.0
the ballon will suffer a aparent g in gap direction
 one year ago

experimentXBest ResponseYou've already chosen the best response.0
dw:1348771165934:dw
 one year ago

RaphaelFilgueirasBest ResponseYou've already chosen the best response.0
dw:1348771181320:dw
 one year ago

RaphaelFilgueirasBest ResponseYou've already chosen the best response.0
the buyont force will be in same direction of gap
 one year ago

experimentXBest ResponseYou've already chosen the best response.0
helium is tricky gas. should have noted.
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.0
pressure differential. well, I feel dumb. http://www.youtube.com/watch?v=Vi8t0x6zZNY&feature=player_detailpage#t=1524s
 one year ago

experimentXBest ResponseYou've already chosen the best response.0
haven't taken this course yet. is it first year mechanics?
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.0
It's not calc. based year one physics?
 one year ago
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