anonymous
  • anonymous
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
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
|dw:1348769313139:dw|
anonymous
  • anonymous
I'm not sure where traction fits in to this...
anonymous
  • anonymous
think he means Tension.

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anonymous
  • anonymous
Oh, I see. Well, what are your thoughts?
anonymous
  • anonymous
it's tension like @Algebraic! said
anonymous
  • anonymous
my thoughts are too despicable to be aired in this forum.
anonymous
  • anonymous
@RaphaelFilgueiras Do you think it goes forward or backward?
experimentX
  • experimentX
|dw:1348770606550:dw|
anonymous
  • anonymous
@Jemurray3 i know the answer
anonymous
  • anonymous
Oh, okay :) And @experimentX consider the acceleration as a gravitational field pointing towards the back of the car.
experimentX
  • experimentX
I was thinking that the baloon will experience backward with respect to the frame.|dw:1348770823195:dw|
anonymous
  • anonymous
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.
anonymous
  • anonymous
|dw:1348770974869:dw|
experimentX
  • experimentX
Woops ... never considered that fact.
anonymous
  • anonymous
@Algebraic! that is true except the balloon goes to the front, not the back.
experimentX
  • experimentX
Clever problem indeed!!
anonymous
  • anonymous
the answer is c)
anonymous
  • anonymous
hmm, how?
anonymous
  • anonymous
|dw:1348771067476:dw|
anonymous
  • anonymous
Walter Lewin actually does a demonstration of this effect in his 8.01 course, if you want to see it for yourself.
anonymous
  • anonymous
I think I remember seeing it, actually. I just don't remember the logic.
anonymous
  • anonymous
the ballon will suffer a aparent g in gap direction
experimentX
  • experimentX
|dw:1348771165934:dw|
anonymous
  • anonymous
|dw:1348771181320:dw|
anonymous
  • anonymous
the buyont force will be in same direction of gap
experimentX
  • experimentX
helium is tricky gas. should have noted.
anonymous
  • anonymous
pressure differential. well, I feel dumb. http://www.youtube.com/watch?v=Vi8t0x6zZNY&feature=player_detailpage#t=1524s
experimentX
  • experimentX
haven't taken this course yet. is it first year mechanics?
anonymous
  • anonymous
It's not calc. based year one physics?

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