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beezyshaw

Brain Teaser

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You're riding on a bus. The kid next to you has a helium-filled balloon. He lets go of the balloon and it ends up against the ceiling, just about in the center of the bus. The driver suddenly hits the gas pedal and the bus lurches forward, throwing you back into your seat. What does the balloon do?

a) It moves backward.
b) It moves forward.
c) It stays where it is.

Edit: Give the reason for your answer

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Moves forward?
Relative density of helium and air, sloshing air causes the balloon to be propelled forward as the air is sloshed at the back?

I'm guessing.:S
--------------------

He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me. Thomas Jefferson

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c:

the relative inertia of the balloon most likely is not enough to overcome the coefficient of friction between the balloon and the ceiling of the bus, and the resistance of the air around it.
Goddam dirty hippies piss me off! ~GFD
"What do I get for closing your rig?" ~ me
"Anything you want." ~ female skydiver
Mohoso Rodriguez #865

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You are correct! Because the air is pushed to the back, and the helium is lighter than air, the balloon would move forward. Now go pick a prize from the prize box.


If all the windows and doors were closed the air would not be "sloshed" anywhere.There would be no pressure change. therefore the air would move as a solid block.
~J
"One flew East,and one flew West..............one flew over the cuckoo's nest"
"There's absolutely no excuse for the way I'm about to act"

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It lays flat on the floor as i inhaled all the gas before the driver hit the pedal



And shrek spends the next 5 minutes singing in a high falsetto voice, shattering everyone's ear drums within earshot. :S :D
"Mediocre people don't like high achievers, and high achievers don't like mediocre people." - SIX TIME National Champion coach Nick Saban

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