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 2 years 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
 2 years 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

This Question is Closed

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

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

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

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

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

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

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

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

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

Jemurray3
 2 years ago
Best ResponseYou've already chosen the best response.2Oh, okay :) And @experimentX consider the acceleration as a gravitational field pointing towards the back of the car.

experimentX
 2 years ago
Best ResponseYou've already chosen the best response.0I was thinking that the baloon will experience backward with respect to the frame.dw:1348770823195:dw

Jemurray3
 2 years ago
Best ResponseYou've already chosen the best response.2Not 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.

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

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

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

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

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

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

Jemurray3
 2 years ago
Best ResponseYou've already chosen the best response.2Walter Lewin actually does a demonstration of this effect in his 8.01 course, if you want to see it for yourself.

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

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

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

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

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

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

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

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

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