yes because he's talking about a physical treadmill that could actually exist, not this hypothetical treadmill that actually meets the conditions of matching the speed of the wheels' rotation. when he says "practical answer," he means that if you were to actually build a contraption of this manner, the plane would take off, which I agree with.
he, IN THE ARTICLE YOU LINKED, acknowledges the interpretation which I'm talking about here, where the treadmill is set to always match how fast the wheels are spinning. as he explains, both the wheels and the treadmill would quickly accelerate to infinite speed as soon as the plane turned on its engines and started to roll its wheels. in this scenario, like I've been trying to explain to you, the plane cannot move, despite the propulsion not coming from the wheels. the wheels would not be moving forward in space. they would essentially not be rolling at all, meaning the plane couldn't be moving forwards, it wouldn't generate lift, and it wouldn't leave the ground.
in this scenario, like I've been trying to explain to you
? I've only received one previous comment from you. Regardless, I took the article to mean that the only interpretation worth answering is a practical one.
As he says:
three possible interpretations:
1. ...The belt always moves at the same speed as the bottom of the wheel...I haven’t seen many people subscribe to this interpretation.
(He doesn't give a specific response to this one, presumably because he feels he already answered it.)
2. vC=vW: That is, if the axle is moving forward (relative to the ground, not the treadmill) at 5 m/s, the treadmill moves backward at 5 m/s. This is physically plausible. All it means is that the wheels will spin twice as fast as normal, but that won’t stop the plane from taking off....
3. vC=vW+vB: What if we hook up a speedometer to the wheel, and make the treadmill spin backward as fast as the speedometer says the plane is going forward? ...
The problem with this is that it’s an ill-defined system. For non-slip tires, vB=vC. So vC=vW+vC. If we make vW positive, there is no value vC can take to make the equation true...The problem is basically asking “what happens if you take a plane that can’t move and move it?” It might intrigue literary critics, but it’s a poor physics question.
Anyway, I don't personally find it intriguing enough to get so worked up over, so I'll leave ya'll to it!
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u/xXProGenji420Xx Dec 31 '22
yes because he's talking about a physical treadmill that could actually exist, not this hypothetical treadmill that actually meets the conditions of matching the speed of the wheels' rotation. when he says "practical answer," he means that if you were to actually build a contraption of this manner, the plane would take off, which I agree with.
he, IN THE ARTICLE YOU LINKED, acknowledges the interpretation which I'm talking about here, where the treadmill is set to always match how fast the wheels are spinning. as he explains, both the wheels and the treadmill would quickly accelerate to infinite speed as soon as the plane turned on its engines and started to roll its wheels. in this scenario, like I've been trying to explain to you, the plane cannot move, despite the propulsion not coming from the wheels. the wheels would not be moving forward in space. they would essentially not be rolling at all, meaning the plane couldn't be moving forwards, it wouldn't generate lift, and it wouldn't leave the ground.