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

Status: Not Logged In; Sign In

Gunman Ambushes Border Patrol Agents In Texas Amid Anti-ICE Rhetoric From Democrats Texas Flood Why America Built A Forest From Canada To Texas Tucker Carlson Interviews President of Iran Mosoud Pezeshkian PROOF Netanyahu Wants US To Fight His Wars RAPID CRUSTAL MOVEMENT DETECTED- Are the Unusual Earthquakes TRIGGER for MORE (in Japan and Italy) ? 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

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: 2234
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 # 19.

#2. To: Jhoffa_ (#0)

No.

The plane much reach takeoff "air speed", a certain speed of air flowing over the wings at which lift is generated by the wings. The plane must move forward, relative to the air flow over the wings. Merely rotating the wheels via the conveyer while the plane is otherwise motionless relative to the air won't get it done.

Now, a wind tunnel instead of a conveyor....

Starwind  posted on  2005-12-01   1:16:01 ET  Reply   Untrace   Trace   Private Reply  

True.. can I change my answer ?? :P

Zipporah  posted on  2005-12-01   1:19:31 ET  Reply   Untrace   Trace   Private Reply  

Are you sure you want to?

Jhoffa_  posted on  2005-12-01   1:21:09 ET  Reply   Untrace   Trace   Private Reply  

Are you sure you want to?

LOL! I was wrong.

The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation.

That is another way to say, the conveyor moves forward at the exact same speed of the plane, but the wheels never actually rotate.

So the plane would gather speed, the conveyor keeps pace, the wheels never rotate, lift is produced as the air flows over the wings, plane takes off.

See, Zipporah, you were right the first time :)

Starwind  posted on  2005-12-01   1:41:45 ET  Reply   Untrace   Trace   Private Reply  

See, Zipporah, you were right the first time :)

Well crap.. see it was your fault :P

Zipporah  posted on  2005-12-01   1:49:02 ET  Reply   Untrace   Trace   Private Reply  

#21. To: Zipporah (#19)

see it was your fault :P

It's a dirty, thankless job, but someone has to do it.

Starwind  posted on  2005-12-01 01:51:41 ET  Reply   Untrace   Trace   Private Reply  

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

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