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

Status: Not Logged In; Sign In

You Know What Happens Next Cash Jordan: Half-Built Tower Abandoned… as ICE Deports Entire ‘Migrant Workforce’ Heavy rainfall causes flash flooding Tuesday night, some cars stuck in high water on Chicago's West Biden Doctor PLEADS THE FIFTH, Refuses To Testify To Congress, Biden Pardons ARE VOID Joe Rogan says FBI director Kash Patel played him for a fool and maga for fools with the Jeff Epstein files Elon's AI System "Grok" Went Rogue And Has Been SHUT DOWN in an Emergency! Earthquake Swarms at One of the MOST DANGEROUS Volcanoes in the USA Ben Shapiro Declares Epstein Case CLOSED: ‘Facts on the Ground Have Changed’ Iran receives 40 Chinese J10-C Fighter Jets China’s Railgun Is Now Battle-Ready, Thanks to Nuclear Power Chinese Hypersonic Advancements! Deadly new missile could decimate entire US fleet in 20 minutes Iran Confirms Massive Chinese HQ 9 B Missile Deal Why Is Europe Hitting 114°F And Still Rising? The INCREDIBLE Impacts of Methylene Blue The LARGEST Eruptions since the Merapi Disaster in 2010 at Lewotobi Laki Laki in Indonesia Feds ARREST 11 Leftists For AMBUSH On ICE, 2 Cops Shot, Organized Terror Cell Targeted ICE In Texas What is quantum computing? 12 Important Questions We Should Be Asking About The Cover Up The Truth About Jeffrey Epstein TSA quietly scraps security check that every passenger dreads Iran Receives Emergency Airlift of Chinese Air Defence Systems as Israel Considers New Attacks Russia reportedly used its new, inexpensive Chernika kamikaze drone in the Ukraine Iran's President Says the US Pledged Israel Wouldn't Attack During Previous Nuclear Negotiations Will Japan's Rice Price Shock Lead To Government Collapse And Spark A Global Bond Crisis Beware The 'Omniwar': Catherine Austin Fitts Fears 'Weaponization Of Everything' Roger Stone: AG Pam Bondi Must Answer For 14 Terabytes Claim Of Child Torture Videos! 'Hit Us, Please' - America's Left Issues A 'Broken Arrow' Signal To Europe Cash Jordan Trump Deports ‘Thousands of Migrants’ to Africa… on Purpose Gunman Ambushes Border Patrol Agents In Texas Amid Anti-ICE Rhetoric From Democrats Texas Flood Why America Built A Forest From Canada To Texas

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: 2399
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 # 147.

#125. To: Jhoffa_ (#0)

Here's one for you.

Your in a boat in a pond. You throw something overboard, it sinks.

Does the level of the pond go up, go down or stay the same?

timetobuildaboat  posted on  2005-12-02   18:13:10 ET  Reply   Untrace   Trace   Private Reply  

it sinks.

Does the level of the pond go up, go down or stay the same?

"Unthinking respect for authority is the greatest enemy of truth." - Albert Einstein

I'll bite. Because what you threw sinks, it is denser than water. The boat would rise upwards enough to equal the water weight of the rock (negitive displacement?) This would cause the water in the pond to become lower.

BUT, the rock's volume would cause the water level to rise. As the rock is denser than the water (it sinks), the volume of water displaced by the rock is less than the volume of water need to float the rock when it was in the boat.

So the boat rises AND the level of the water is lowered.

Nice question.

tom007  posted on  2005-12-02   19:33:41 ET  Reply   Untrace   Trace   Private Reply  

So the boat rises AND the level of the water is lowered.

Ding, ding, ding.....we have a winner.

The simple fact that it sinks tells you that it is denser than water and would displace more water in the boat than it does when you let it fall to the bottom where it would rest it's weight.

timetobuildaboat  posted on  2005-12-02   19:43:07 ET  Reply   Untrace   Trace   Private Reply  

So the boat rises AND the level of the water is lowered.

Ding, ding, ding.....we have a winner.

The simple fact that it sinks tells you that it is denser than water and would displace more water in the boat than it does when you let it fall to the bottom where it would rest it's weight.

I stand corrected. I should have done the math. I got too caught up in taking a stab at political humor, lol.

A 100 ton boat displaces 100 tons of water. If 99.999 tons of nearly infinite density material contained within a thimble is suddenly dumped over the side it will displace next to nothing, and neither will what's left of the boat.

My bad. Well done.

markm0722  posted on  2005-12-02   19:54:20 ET  Reply   Untrace   Trace   Private Reply  

Imagine a boat with a chunk of a star in it weighing hundreds of tons and it's the size of a thimble and you throw it overboard......

timetobuildaboat  posted on  2005-12-02   19:56:48 ET  Reply   Untrace   Trace   Private Reply  

Imagine a boat with a chunk of a star in it weighing hundreds of tons and it's the size of a thimble and you throw it overboard......

I actually used a bit of a neutron star in my mental picture (give or take), so you aren't far off! ;)

markm0722  posted on  2005-12-02   20:06:37 ET  Reply   Untrace   Trace   Private Reply  

One of the brighter of the minions.....congratulations

timetobuildaboat  posted on  2005-12-02   20:08:26 ET  Reply   Untrace   Trace   Private Reply  

        There are no replies to Comment # 147.

End Trace Mode for Comment # 147.

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

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