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PhysicsGuy
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| Number of Posts: | 17 |
| Registered on: | 4/11/2024 |
| Online Status: | Not Online |
Recent Posts
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re: Ancient civilizations. Y or N?
Posted by PhysicsGuy on 5/7/24 at 9:09 pm
[quote]I bet you wish that were true.[/quote]
He doesn’t have to bet, you’ve made it very clear it’s true. ...
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re: Who is the most forgettable president?
Posted by PhysicsGuy on 5/4/24 at 8:04 pm
[quote]Andrew Johnson should be the most forgettable. He held a grudge against the South after the war and almost got impeached by one vote.[/quote]
He might be the worst, but your history on him is the opposite of reality. He was impeached by republicans though because they thought he was way to...
re: IRS collected a gargantuan $7 billion estate tax from a single source, nobody knows who
Posted by PhysicsGuy on 4/18/24 at 8:36 pm
[quote]You could win one of those billion dollar powerballs and invest 500 mil at a 10% annual return and in 30 years be worth 2 billion if you don’t blow money. I imagine a lot of oil families in Texas and Oklahoma made hundreds of millions and invested it to be worth way more than we realize. You ...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 11:24 pm
[quote]New to thread, I'm guessing the assumption that there is perfect transfer between wheels and conveyer. So whatever speed the conveyer spins at, the wheels automatically experience an opposite and equal spin rate... and then once you add thrust, the conveyer can never equal the other side of t...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 11:22 pm
Because the belt can never go faster than the wheels, they are free spinning so they match the speed of the belt 1 for 1. Hence why when you add in thrust the belt is always behind because everything it does to speed up to match the thrust is just instantly offset by a corresponding wheel accelerati...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 11:00 pm
[quote]It says they move exactly the same speed.[/quote]
It doesn’t say that. It says a conveyor belt designed to match the speed of the wheels, moving in the opposite direction.
Answer: the plane takes off because it can’t match the speed it’s mathematically impossible. The wheels will alway...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 10:23 pm
Yep the plane will just behave normally. ...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 10:19 pm
No we don’t. Why is everyone so hung up on this. What does the riddle actually say? Have you never heard of something not doing what’s it’s designed to do? It’s designed to match the speed, math says it can’t. The question doesn’t say the wheels can never move faster.
You guys are all reading th...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 10:10 pm
That’s literally what the question says, if people don’t agree with it then they are answering a different riddle. ...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 10:09 pm
My man the speed of the wheels is speed of the belt plus speed from thrust. If the speed from thrust is 10, you can pick any number you want for the speed of the belt because the speed of the wheels will be that number plus 10. X can never equal X+10. ...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 9:55 pm
Correct, because even if designed perfectly the belt will always fail to match. ...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 9:50 pm
It doesn’t imply that, you interpreted it that way. The question is from world of engineering and it says the belt is designed to match the speed.
Engineering answer is it’s not possible to design it mathematically. What happens is the backwards speed of the belt is offset by the forward speed o...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 9:36 pm
No one said they would be. They would be different than the belt.
I mean you can Google this if you don’t want to believe me. The answer is it moves and not only that it moves as if the belt wasn’t even there. ...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 9:34 pm
That’s irrelevant because at the wheel the thrust is converted to forward velo. The point is if z is x plus y, so long as y is not zero x can never equal z, at any number. ...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 9:31 pm
It can’t instantly match it, that’s the point. No one seemed to read the question correctly and got hung up on the plane. The riddle is no belt can be designed to match the wheels because the wheels speed is the speed of the belt plus an independent source of forward motion. Meaning the wheels alway...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 9:26 pm
The riddle isn’t does the plane move it’s that it’s impossible for a conveyor to be designed to match the speed of the wheels. The wheels speed is the speed of the belt plus the additional speed of the trust, so be it 1 mph or infinity the speed of the wheels will always be higher. ...
re: Can this 747 take off?
Posted by PhysicsGuy on 4/11/24 at 9:14 pm
I can’t believe this thread. Let me help out everyone who said no, because they don’t understand the physics or those who said no because of the wording of the question. The answer is yes even within the confines of the question, which is what makes it a trick question.
The question says the con...
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