Weird scientific questions

[a-4-year-old]

Huh, I always thought a number = that number. 5.11111... doesn't equal 5 I thought, isn't it the same type of problem, or am I just stupid. I am bad at math btw.

It's a mathematical paradox. There's even a way to get 1 = 2 !

EDIT:
Here it is:

a = b     Let's pick two equal numbers, a and b.
a^2 = a b     Multiply both sides by a.
a^2 - b^2 = a b - b^2     Subtract b^2 from both sides.
(a - b)(a + b) = b (a - b)     Factor each side using algebra.
a + b = b     Cancel the common factor on both sides
b + b = b ; 2b = b     Substitute a = b (step 1) and simplify
2 = 1

If you do math wrong then you can get anything to equal anything.

[Svirin Kerath]

Huh, I always thought a number = that number. 5.11111... doesn't equal 5 I thought, isn't it the same type of problem, or am I just stupid. I am bad at math btw.

It's a mathematical paradox. There's even a way to get 1 = 2 !

EDIT:
Here it is:

a = b     Let's pick two equal numbers, a and b.
a^2 = a b     Multiply both sides by a.
a^2 - b^2 = a b - b^2     Subtract b^2 from both sides.
(a - b)(a + b) = b (a - b)     Factor each side using algebra.
a + b = b     Cancel the common factor on both sides
b + b = b ; 2b = b     Substitute a = b (step 1) and simplify
2 = 1

If you do math wrong then you can get anything to equal anything.

He just divided by 0.

[mar77a]

you just can't do that in maths

eg:

1/2 = 0.5
- because -
1 = 0.5*2

then

0/0 = ?
0 = ?*0

? = |R


oh and 0.99~ = 1 isn't a paradox or anything...it makes perfect sense (if you have studied limits and infinites etc)

[KorrupT MerC]

Hypothetically if we had a megatrain that was, say, infinitely long and suitably high and wide, and we had an airplane take off through it in the opposite direction that it was traveling in, yes, the airplane WOULD lift off the floor of the train due to the fact that inertia is carrying the air inside of the train in the same direction that the train was moving in. If the train was moving at >~200-300 mph, then, yes, you can actually have an airplane that is flying 'forward' with positive speed yet has a negative velocity (not talking about aircraft cruising speed, which varies greatly).

Alright this might be just a bunch of nonsense, but it might be correct, im no science major..

But what makes the air in the train move? You know how a train is sectioned off to make seperate cars, now since you wouldnt be able to have a plane take off with a bunch of seperate cars, it would have to be one single infinitely long car and if that is so, this is where my question comes in, does the air only move with the train if its sectioned off? (like the back of the car, is pushing the air with the train) if you had one infinitely long car, their would be no back to it to push the air along with the train, so would the air just stay still or does it still move with the train?

[LtKillroy]

As for the midget thing, it all depends. In the US, according to 5 or 6 sights I googled, is 4"10', but you also have to remember average height in, say, Vietnam is a lot lower. So to answer your question, you can't really answer your question.

[urraka]

Hypothetically if we had a megatrain that was, say, infinitely long and suitably high and wide, and we had an airplane take off through it in the opposite direction that it was traveling in, yes, the airplane WOULD lift off the floor of the train due to the fact that inertia is carrying the air inside of the train in the same direction that the train was moving in. If the train was moving at >~200-300 mph, then, yes, you can actually have an airplane that is flying 'forward' with positive speed yet has a negative velocity (not talking about aircraft cruising speed, which varies greatly).

Alright this might be just a bunch of nonsense, but it might be correct, im no science major..

But what makes the air in the train move? You know how a train is sectioned off to make seperate cars, now since you wouldnt be able to have a plane take off with a bunch of seperate cars, it would have to be one single infinitely long car and if that is so, this is where my question comes in, does the air only move with the train if its sectioned off? (like the back of the car, is pushing the air with the train) if you had one infinitely long car, their would be no back to it to push the air along with the train, so would the air just stay still or does it still move with the train?

I think nobody took so serious the concept of an infinitely long train. The air moves with the train if it's closed, so it's like you say with the example of a car. And instead of an infinitely long train you can think of a ver small plane, or no?

[Aniway]

Try to do this one (I want to see if you are atleast a bit skilled!):
-5^2= ? ? ?
What is the above equal to?

[frogboy]

That's not difficult at all, it just depends whether it's (-5)^2 or -(5^2), which means it's 25 or -25.

We're having an insightful discussion about trains and planes and you shit it up with your simple maths. Go away.

[a-4-year-old]

since there is no () we can assume it is -(5^2) therefore -25

airplanes generate lift through air flowing over and under the airfoil of the wing, since the plane isn't moving relative to the ground (and therefore the air) the wings generate no lift and the plane cannot fly.

[Aniway]

HAHAHA FOOLS! THE ANSWER IS 25 AND NOT -25

[a-4-year-old]

aniway, you don't know shit about shit.

[Shivorken]

HAHAHA FOOLS! THE ANSWER IS 25 AND NOT -25

You idiot, you didn't put brackets in your original question. Your wrong.

As for the plane on the windmill, from the planes frame of reference, it is on stationary ground (but this is only if it is in an inertial frame of reference. You did not state whether the threadmill is accelerating or moving at a constant speed. I assume it is constant), therefore the plane will be able to take off just like normal. Lets make the threadmill instead to be Earth. Earth has rotational speed, orbital speed, and also the galaxy is moving. But planes are still able to take off on the surface of the Earth.

[a-4-year-old]

shivorken, your argument doesn't make any sense.

[frogboy]

Lets make the threadmill instead to be Earth. Earth has rotational speed, orbital speed, and also the galaxy is moving. But planes are still able to take off on the surface of the Earth.

Irrelevant because the Earth has enough mass that it causes a noticeable gravitational effect, while the treadmill doesn't.

[urraka]

HAHAHA FOOLS! THE ANSWER IS 25 AND NOT -25

You idiot, you didn't put brackets in your original question. Your wrong.

As for the plane on the windmill, from the planes frame of reference, it is on stationary ground (but this is only if it is in an inertial frame of reference. You did not state whether the threadmill is accelerating or moving at a constant speed. I assume it is constant), therefore the plane will be able to take off just like normal. Lets make the threadmill instead to be Earth. Earth has rotational speed, orbital speed, and also the galaxy is moving. But planes are still able to take off on the surface of the Earth.

You actually don't know how many things are moving, so actually we may be always in the same absolue position. Any-way, as 4-year-young said you don't make ANY SENSE

[Kszchroink]

As for the midget thing, it all depends. In the US, according to 5 or 6 sights I googled, is 4"10', but you also have to remember average height in, say, Vietnam is a lot lower. So to answer your question, you can't really answer your question.

You're racist. I don't listen to racists. Stop being so racist!

[The Geologist]

This topic is made of justice and win. 

[Serial K!ller]

HAHAHA FOOLS! THE ANSWER IS 25 AND NOT -25

You idiot, you didn't put brackets in your original question. Your wrong.

As for the plane on the windmill, from the planes frame of reference, it is on stationary ground (but this is only if it is in an inertial frame of reference. You did not state whether the threadmill is accelerating or moving at a constant speed. I assume it is constant), therefore the plane will be able to take off just like normal. Lets make the threadmill instead to be Earth. Earth has rotational speed, orbital speed, and also the galaxy is moving. But planes are still able to take off on the surface of the Earth.

but the atmosphere is moving with it so no airflow so no lift

[LtKillroy]

As for the midget thing, it all depends. In the US, according to 5 or 6 sights I googled, is 4"10', but you also have to remember average height in, say, Vietnam is a lot lower. So to answer your question, you can't really answer your question.

You're racist. I don't listen to racists. Stop being so racist!

It's funny how you refuse to be wrong but are bad at it. As for the plane, I don't see how there is a discussion. There is no air movement, so it can't take off. The treadmill could be moving at 2,000 MPH so the plane would be moving at 2,000 MPH, but since the air isn't moving, no lift. Back to the fourth grade with ye.

[Kszchroink]

As for the midget thing, it all depends. In the US, according to 5 or 6 sights I googled, is 4"10', but you also have to remember average height in, say, Vietnam is a lot lower. So to answer your question, you can't really answer your question.

You're racist. I don't listen to racists. Stop being so racist!

It's funny how you refuse to be wrong but are bad at it.

What the fuck does that have to do with me calling you a racist? Stop recycling retorts you've read in other forums.

There is no air movement, so it can't take off. The treadmill could be moving at 2,000 MPH so the plane would be moving at 2,000 MPH, but since the air isn't moving, no lift. Back to the fourth grade with ye.

protip: airplane wheels don't work like car wheels.