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| I figured I should finally get around to posting the answer since Google seems to think my first post about this is the authority on the topic. I don't know why but currently a search for "airplane vs treadmill" shows it at the first result that is not a YouTube video.
If you don't know the airplane vs treadmill (or airplane vs conveyor belt) problem check out my first post about it here.
The
usual way to try to explain why an airplane can take off from a
treadmill is to explain the difference between how a car generates
thrust and how an airplane generates thrust. Although this is an
important difference it does not get at what I see as the real
misunderstanding here.
It all comes down to speed and how you
are measuring it. More precisely what you are measuring it relative
to. You must use a consistent reference point. The normal object we
measure speed relative to works good for this. That object being the
earth.
I am going to explain how this by changing the situation a little to something we can all relate to a little better. Let's replace the airplane with a car. The car accelerates so the speedometer reads 10mph. The treadmill rotates in the opposite direction as the car is pointing at 10mph. How fast is the car going? If you say it is going 10mph you are wrong. If you consider what a radar gun pointed at the car would show or use common sense you would know that the car is not moving. Or stated another way it is going 0mph relative to the earth. Which if you think back to the problem would mean that the treadmill should therefore not be rotating. The only way based on the problem for the treadmill to move is if the object on it is moving. The car or plane has to be moving relative to the earth in order for the treadmill to move in the other direction.
If the speed of the treadmill is based on the speed of the plane you can not use the treadmill as your reference for the speed of the plane otherwise the speeds will always be equal and therefore ultimately useless.
So if the airplane has t be moving forward relative to the earth for the treadmill to rotate in the opposite direction everyone should be able to see that a plane that is moving forward can definitely takeoff.
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Your Score: the Prankster
(19% dark, 30% spontaneous, 15% vulgar)
your humor style:
CLEAN | COMPLEX | LIGHT
Your humor has an intellectual, even conceptual slant to it. You're not pretentious, but you're not into what some would call 'low humor' either. You'll laugh at a good dirty joke, but you definitely prefer something clever to something moist. You probably like well-thought-out pranks and/or spoofs and it's highly likely you've tried one of these things yourself. In a lot of ways, yours is the most entertaining type of humor because it's smart without being mean-spirited.
PEOPLE LIKE YOU: Conan O'Brian - Ashton Kutcher
The 3-Variable Funny Test!
- it rules -
If you're interested, try my best friend's best test:
The Genghis Khan Genetic Fitness Masterpiece
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| Here is an interesting map of the US with the states renamed for countries that have the same GDP as them.
To help put this in perspective:
- California, it is often said, would be the world’s
sixth- or seventh-largest economy if it was a separate country.
Actually, that would be the eighth, according to this map, as France (with a GDP of $2,15 trillion) is #8 on the aforementioned list.
- Texas’ economy is significantly smaller, exactly half of California’s, as its GDP compares to that of Canada (#10, $1,08 trillion).
- Florida also does well, with its GDP comparable to Asian tiger South Korea’s (#13 at $786 billion).
- Illinois – Mexico (GDP #14 at $741 billion)
- New Jersey – Russia (GDP #15 at $733 billion)
- Ohio – Australia (GDP #16 at $645 billion)
- New York – Brazil (GDP #17 at $621 billion)
- Pennsylvania – Netherlands (GDP #18 at $613 billion)
- Georgia – Switzerland (GDP #19 at $387 billion)
- North Carolina – Sweden (GDP #20 at $371 billion)
- Massachusetts – Belgium (GDP #21 at $368 billion)
- Washington – Turkey (GDP #22 at $358 billion)
- Virginia – Austria (GDP #24 at $309 billion)
- Tennessee – Saudi Arabia (GDP #25 at $286 billion)
- Missouri – Poland (GDP #26 at $265 billion)
- Louisiana – Indonesia (GDP #27 at $264 billion)
- Minnesota – Norway (GDP #28 at $262 billion)
- Indiana – Denmark (GDP #29 at $256 billion)
- Connecticut – Greece (GDP #30 at $222 billion)
- Michigan – Argentina (GDP #31 at $210 billion)
- Nevada – Ireland (GDP #32 at $203 billion)
- Wisconsin – South Africa (GDP #33 at $200 billion)
- Arizona – Thailand (GDP #34 at $197 billion)
- Colorado – Finland (GDP #35 at $196 billion)
- Alabama – Iran (GDP #36 at $195 billion)
- Maryland – Hong Kong (#37 at $187 billion GDP)
- Kentucky – Portugal (GDP #38 at $177 billion)
- Iowa – Venezuela (GDP #39 at $148 billion)
- Kansas – Malaysia (GDP #40 at $132 billion)
- Arkansas – Pakistan (GDP #41 at $124 billion)
- Oregon – Israel (GDP #42 at $122 billion)
- South Carolina – Singapore (GDP #43 at $121 billion)
- Nebraska – Czech Republic (GDP #44 at $119 billion)
- New Mexico – Hungary (GDP #45 at $113 billion)
- Mississippi – Chile (GDP #48 at $100 billion)
- DC – New Zealand (#49 at $99 billion GDP)
- Oklahoma – Philippines (GDP #50 at $98 billion)
- West Virginia – Algeria (GDP #51 at $92 billion)
- Hawaii – Nigeria (GDP #53 at $83 billion)
- Idaho – Ukraine (GDP #54 at $81 billion)
- Delaware – Romania (#55 at $79 billion GDP)
- Utah – Peru (GDP #56 at $76 billion)
- New Hampshire – Bangladesh (GDP #57 at $69 billion)
- Maine – Morocco (GDP #59 at $57 billion)
- Rhode Island – Vietnam (GDP #61 at $48 billion)
- South Dakota – Croatia (GDP #66 at $37 billion)
- Montana – Tunisia (GDP #69 at $33 billion)
- North Dakota – Ecuador (GDP #70 at $32 billion)
- Alaska – Belarus (GDP #73 at $29 billion)
- Vermont – Dominican Republic (GDP #81 at $20 billion)
- Wyoming – Uzbekistan (GDP #101 at $11 billion)
Map and information from strangemaps.wordpress.com
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Your Five Factor Personality Profile
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Extroversion:
You have low extroversion.
You are quiet and reserved in most social situations.
A low key, laid back lifestyle is important to you.
You tend to bond slowly, over time, with one or two people.
Conscientiousness:
You have low conscientiousness.
Impulsive and off the wall, you don't take life too seriously.
Unfortunately, you sometimes end up regretting your snap decisions.
Overall, you tend to lack focus, and it's difficult for you to get important things done.
Agreeableness:
You have high agreeableness.
You are easy to get along with, and you value harmony highly.
Helpful and generous, you are willing to compromise with almost anyone.
You give people the benefit of the doubt and don't mind giving someone a second chance.
Neuroticism:
You have low neuroticism.
You are very emotionally stable and mentally together.
Only the greatest setbacks upset you, and you bounce back quickly.
Overall, you are typically calm and relaxed - making others feel secure.
Openness to experience:
Your openness to new experiences is medium.
You are generally broad minded when it come to new things.
But if something crosses a moral line, there's no way you'll approve of it.
You are suspicious of anything too wacky, though you do still consider creativity a virtue.
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| What American accent do you have? Your Result: The Inland North You may think you speak "Standard English straight out of the dictionary" but when you step away from the Great Lakes you get asked annoying questions like "Are you from Wisconsin?" or "Are you from Chicago?" Chances are you call carbonated drinks "pop." | | The Midland | | | Philadelphia | | | The South | | | The Northeast | | | North Central | | | The West | | | Boston | | What American accent do you have?
Quiz Created on GoToQuiz |
That maybe what the quiz says, but I think the only accent I have is my Hyundai.
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