The "Plane on a Treadmill" Question - Page 5

SteveDallas · 12-07-2006, 12:37 PM

You sound like you're itching to re-do the problem with accurate friction coefficients included!

Undertoad · 12-07-2006, 12:38 PM

The stated scenario is that the treadmill moves the same speed as the plane. According to your (flint's) take (faulty) on the question, the plane doesn't move and therefore the treadmill doesn't move.

Flint · 12-07-2006, 12:38 PM

Re-do whatever you want, but the answer to this question is: a stationary plane will not take off spontaneously.

Quote:

Originally Posted by Undertoad

According to your (flint's) take (faulty) on the question, the plane doesn't move and therefore the treadmill doesn't move.

No, the stated (post #1) take (this thread) is that the plane and the treadmill move at equal speeds, in the opposite direction.

Undertoad · 12-07-2006, 12:40 PM

Another way to look at it: can a sea plane take off if it's floating down a current faster than its takeoff speed? Sure, the minute its props spin, it will be generating enough force to overcome the friction of the moving water.

Flint · 12-07-2006, 12:42 PM

Just look at it the way is is, as stated.

SteveDallas · 12-07-2006, 12:43 PM

You've got velocity and acceleration. The engines are applying force to the plane and therefore accelerating it. The treadmill has velocity, but it cannot impart any acceleration to the plane.

LabRat · 12-07-2006, 12:44 PM

Here:

Flint · 12-07-2006, 12:44 PM

blah blah blah

The plane cannot move forward because the question tells you that. It doesn't matter "how" . . . READ THE QUESTION.

LabRat · 12-07-2006, 12:45 PM

Quote:

Originally Posted by Kitsune

The riddle/question is on every other forum. I figure I should bring the torture here, as well.

A plane is standing on a runway that can move, like a giant treadmill. When the plane's engines throttle up, it begins to move forward, but the treadmill is made to match the forward speed of the plane, only in the opposite direction. So, as the plane moves forward, it moves backwards beneath the aircraft.

As the engines throttle up, does the plane take off?

My bolding.

Flint · 12-07-2006, 12:46 PM

Quote:

but

LabRat · 12-07-2006, 12:46 PM

butt

Shawnee123 · 12-07-2006, 12:48 PM

No labrat posts without going back to the butt!

Flint, I totally agree with you. The question says the motion is cancelled. No motion...doesn't matter how.

Flint · 12-07-2006, 12:49 PM

Ya, we know about your butt, okay. It's so awesome, etc.

LabRat · 12-07-2006, 12:50 PM

If you read the red it in my quote as referring to the plane, then the answer would seem to be no, the plane can't take off. I read it as referring to the treadmill, thus the plane will take off.

SteveDallas · 12-07-2006, 12:51 PM

The problem doesn't. It says the speed of the treadmill equals the speed of the airplane. It doesn't say the airplane is prevented from moving forward.

12-07-2006, 12:42 PM	#65
Flint Snowflake Join Date: Mar 2006 Location: Dystopia Posts: 13,136	Just look at it the way is is, as stated. __________________ **************** There's a level of facility that everyone needs to accomplish, and from there it's a matter of deciding for yourself how important ultra-facility is to your expression. ... I found, like Joseph Campbell said, if you just follow whatever gives you a little joy or excitement or awe, then you're on the right track. . . . . . . . . . . . . . . . . . . . . . . . . . . Terry Bozzio**

12-07-2006, 12:44 PM	#67
LabRat twatfaced two legged bumhole Join Date: Jun 2004 Posts: 3,143	Here: Attached Images __________________ Strength does not come from how much weight you can lift, or how many miles you can run. It comes from knowing that you set a goal, and rose to the challenge. Strength comes from within.

12-07-2006, 12:44 PM	#68
Flint Snowflake Join Date: Mar 2006 Location: Dystopia Posts: 13,136	blah blah blah The plane cannot move forward because the question tells you that. It doesn't matter "how" . . . READ THE QUESTION. __________________ **************** There's a level of facility that everyone needs to accomplish, and from there it's a matter of deciding for yourself how important ultra-facility is to your expression. ... I found, like Joseph Campbell said, if you just follow whatever gives you a little joy or excitement or awe, then you're on the right track. . . . . . . . . . . . . . . . . . . . . . . . . . . Terry Bozzio**

12-07-2006, 12:46 PM	#71
LabRat twatfaced two legged bumhole Join Date: Jun 2004 Posts: 3,143	butt __________________ Strength does not come from how much weight you can lift, or how many miles you can run. It comes from knowing that you set a goal, and rose to the challenge. Strength comes from within.

12-07-2006, 12:48 PM	#72
Shawnee123 Why, you're a regular Alfred E Einstein, ain't ya? Join Date: Jun 2006 Posts: 21,206	No labrat posts without going back to the butt! Flint, I totally agree with you. The question says the motion is cancelled. No motion...doesn't matter how. __________________ A word to the wise ain't necessary - it's the stupid ones who need the advice. --Bill Cosby

12-07-2006, 12:37 PM	#61
SteveDallas Your Bartender Join Date: Jan 2002 Location: Philly Burbs, PA Posts: 7,651	You sound like you're itching to re-do the problem with accurate friction coefficients included!

12-07-2006, 12:38 PM	#62
Undertoad Radical Centrist Join Date: Jan 2001 Location: Cottage of Prussia Posts: 31,423	The stated scenario is that the treadmill moves the same speed as the plane. According to your (flint's) take (faulty) on the question, the plane doesn't move and therefore the treadmill doesn't move.

12-07-2006, 12:40 PM	#64
Undertoad Radical Centrist Join Date: Jan 2001 Location: Cottage of Prussia Posts: 31,423	Another way to look at it: can a sea plane take off if it's floating down a current faster than its takeoff speed? Sure, the minute its props spin, it will be generating enough force to overcome the friction of the moving water.

12-07-2006, 12:43 PM	#66
SteveDallas Your Bartender Join Date: Jan 2002 Location: Philly Burbs, PA Posts: 7,651	You've got velocity and acceleration. The engines are applying force to the plane and therefore accelerating it. The treadmill has velocity, but it cannot impart any acceleration to the plane.

12-07-2006, 12:49 PM	#73
Flint Snowflake Join Date: Mar 2006 Location: Dystopia Posts: 13,136	Ya, we know about your butt, okay. It's so awesome, etc. __________________ **************** There's a level of facility that everyone needs to accomplish, and from there it's a matter of deciding for yourself how important ultra-facility is to your expression. ... I found, like Joseph Campbell said, if you just follow whatever gives you a little joy or excitement or awe, then you're on the right track. . . . . . . . . . . . . . . . . . . . . . . . . . . Terry Bozzio**

12-07-2006, 12:50 PM	#74
LabRat twatfaced two legged bumhole Join Date: Jun 2004 Posts: 3,143	If you read the red it in my quote as referring to the plane, then the answer would seem to be no, the plane can't take off. I read it as referring to the treadmill, thus the plane will take off. __________________ Strength does not come from how much weight you can lift, or how many miles you can run. It comes from knowing that you set a goal, and rose to the challenge. Strength comes from within.

12-07-2006, 12:51 PM	#75
SteveDallas Your Bartender Join Date: Jan 2002 Location: Philly Burbs, PA Posts: 7,651	The problem doesn't. It says the speed of the treadmill equals the speed of the airplane. It doesn't say the airplane is prevented from moving forward.

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