[Home]  [Headlines]  [Latest Articles]  [Latest Comments]  [Post]  [Sign-in]  [Mail]  [Setup]  [Help] 

Status: Not Logged In; Sign In

Google Bets Big On Nuclear Fusion Iran sets a world record by deporting 300,000 illegal refugees in 14 days Brazilian Women Soccer Players (in Bikinis) Incredible Skills Watch: Mexico City Protest Against American Ex-Pat 'Invasion' Turns Viole Kazakhstan Just BETRAYED Russia - Takes gunpowder out of Putin’s Hands Why CNN & Fareed Zakaria are Wrong About Iran and Trump Something Is Going Deeply WRONG In Russia 329 Rivers in China Exceed Flood Warnings, With 75,000 Dams in Critical Condition Command Of Russian Army 'Undermined' After 16 Of Putin's Generals Killed At War, UK Says Rickards: Superintelligence Will Never Arrive Which Countries Invest In The US The Most? The History of Barbecue ‘Pathetic’: Joe Biden tells another ‘tall tale’ during rare public appearance Lawsuit Reveals CDC Has ZERO Evidence Proving Vaccines Don't Cause Autism Trumps DOJ Reportedly Quietly Looking Into Criminal Charges Against Election Officials Volcanic Risk and Phreatic (Groundwater) eruptions at Campi Flegrei in Italy Russia Upgrades AGS-17 Automatic Grenade Launcher! They told us the chickenpox vaccine was no big deal—just a routine jab to “protect” kids from a mild childhood illness Pentagon creates new military border zone in Arizona For over 200 years neurological damage from vaccines has been noted and documented The killing of cardiologist in Gaza must be Indonesia's wake-up call Marandi: Israel Prepares Proxies for Next War with Iran? "Hitler Survived WW2 And I Brought Proof" Norman Ohler STUNS Joe Rogan CIA Finally Admits a Pyschological Warfare Agent from the Agency “Came into Contact” with Lee Harvey Oswald before JFK’s Assassination CNN Stunned As Majority Of Americans Back Trump's Mass Deportation Plan Israeli VS Palestinian Connections to the Land of Israel-Palestine Israel Just Lost Billions - Haifa and IMEC This Is The Income A Family Needs To Be Middle Class, By State One Big Beautiful Bubble": Hartnett Warns US Debt Will Exceed $50 Trillion By 2032 These Are The Most Stolen Cars In Every US State

Science/Tech
See other Science/Tech Articles

Title: Brainteaser: There's an airplane on the runway..
Source: Elsewhere
URL Source: http://www.someplaceelse.com
Published: Dec 1, 2005
Author: I have no idea
Post Date: 2005-12-01 01:10:02 by Jhoffa_
Keywords: Brainteaser:, airplane, runway..
Views: 2181
Comments: 202

Imagine a plane is sat on the beginning of a massive conveyor belt/travelator type arrangement, as wide and as long as a runway, and intends to take off. The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation. There is no wind.

Can the plane take off?

Post Comment   Private Reply   Ignore Thread  

Begin Trace Mode for Comment # 86.

#32. To: Jhoffa_ (#0)

Can the plane take off?

Of course! It doesn't matter what the ground is doing with respect to the wheels, because the wheels don't propel the craft down the runway. The propellor or jet engine cause the plane to move forward and they work just fine even if the ground is moving in the wrong direction. It will just cause the tires to rotate at twice the speed they would normally.

Now I'm going to read the thread and see what everyone else said and whether I've missed something. hehehe

Mr Nuke Buzzcut  posted on  2005-12-01   16:03:45 ET  Reply   Untrace   Trace   Private Reply  

I disagree. Forward motion is what provides the wing lift required for a plane to leave the ground. Forward motion keeps a plane aloft. All engine power would be merely transferred to the conveyor belt through the wheels and there would be no forward motion by the plane and its wings, ergo, no take off.

wbales  posted on  2005-12-01   16:16:23 ET  Reply   Untrace   Trace   Private Reply  

I disagree. Forward motion is what provides the wing lift required for a plane to leave the ground. Forward motion keeps a plane aloft. All engine power would be merely transferred to the conveyor belt through the wheels and there would be no forward motion by the plane and its wings, ergo, no take off.

You are wrong on two counts, one of which is significant to the question.

1) Wing lift is created by the pressure differential created by the air passing over the airfoil surface - the top of which is longer, causing the air to move move swiftly than it does across the bottom.

2) The plane would have forward motion thanks to the thrust caused by the engines. The wheels are irrelevant, neutral, just along for the ride. The conveyor could be run at a speed 100 times that of the forward motion of the aircraft and all it would accomplish is making the wheels spin faster before takeoff. Forward motion and thereby wind speed would in no way be affected.

Mr Nuke Buzzcut  posted on  2005-12-01   18:22:04 ET  Reply   Untrace   Trace   Private Reply  

The plane would have forward motion thanks to the thrust caused by the engines.

That is, BTW, very true ONCE AND ONLY AFTER a plane is airborne.

wbales  posted on  2005-12-01   19:39:35 ET  Reply   Untrace   Trace   Private Reply  

he plane would have forward motion thanks to the thrust caused by the engines. That is, BTW, very true ONCE AND ONLY AFTER a plane is airborne.

wrong, thrust moves it forward and the plane lifts off once air speed is sufficient

give it up, it's starting to hurt

wakeup  posted on  2005-12-02   1:54:36 ET  Reply   Untrace   Trace   Private Reply  

        There are no replies to Comment # 86.

End Trace Mode for Comment # 86.

Top • Page Up • Full Thread • Page Down • Bottom/Latest

[Home]  [Headlines]  [Latest Articles]  [Latest Comments]  [Post]  [Sign-in]  [Mail]  [Setup]  [Help]