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RaphaelFilgueiras
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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
 2 years ago
 2 years ago
RaphaelFilgueiras Group Title
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
 2 years ago
 2 years ago

This Question is Closed

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.0
dw:1348769313139:dw
 2 years ago

Jemurray3 Group TitleBest ResponseYou've already chosen the best response.2
I'm not sure where traction fits in to this...
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.0
think he means Tension.
 2 years ago

Jemurray3 Group TitleBest ResponseYou've already chosen the best response.2
Oh, I see. Well, what are your thoughts?
 2 years ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.0
it's tension like @Algebraic! said
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.0
my thoughts are too despicable to be aired in this forum.
 2 years ago

Jemurray3 Group TitleBest ResponseYou've already chosen the best response.2
@RaphaelFilgueiras Do you think it goes forward or backward?
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.0
dw:1348770606550:dw
 2 years ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.0
@Jemurray3 i know the answer
 2 years ago

Jemurray3 Group TitleBest 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.
 2 years ago

experimentX Group TitleBest 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
 2 years ago

Jemurray3 Group TitleBest 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.
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.0
dw:1348770974869:dw
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.0
Woops ... never considered that fact.
 2 years ago

Jemurray3 Group TitleBest ResponseYou've already chosen the best response.2
@Algebraic! that is true except the balloon goes to the front, not the back.
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.0
Clever problem indeed!!
 2 years ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.0
the answer is c)
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.0
hmm, how?
 2 years ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.0
dw:1348771067476:dw
 2 years ago

Jemurray3 Group TitleBest 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.
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.0
I think I remember seeing it, actually. I just don't remember the logic.
 2 years ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.0
the ballon will suffer a aparent g in gap direction
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.0
dw:1348771165934:dw
 2 years ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.0
dw:1348771181320:dw
 2 years ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.0
the buyont force will be in same direction of gap
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.0
helium is tricky gas. should have noted.
 2 years ago

Algebraic! Group TitleBest 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
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.0
haven't taken this course yet. is it first year mechanics?
 2 years ago

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