You will always be older than me.
I think this is my favorite picture of the two of us because 1.) We are thin, 2.) We are young, and 3.) Other than a few details, it could be any year from 1920 on.
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The temperature of the water that sprays from the shower is the weighted average of the mixture of the hot and cold lines as they pass through the fixture. Everyone knows that you have to let the cold water run awhile, especially in the top floor of an old building, before it gets really cold. If the shower is the first thing turned on, this phenomena causes the shower to slowly get colder as time goes by. To compensate, I subconciously turn the heat up as the shower progresses. If you leave the faucet at high afterward, the next morning when it is turned on and the cold stream is really the lukewarm water in the pipes, the output could be scolding hot. Especially on the area between the knees and the navel where it first hits, especially, especially, certain places that are more precious than any other.
In short, I’m not having a very good day.
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Site of the Day: The Case of the Plane and the Conveyor Belt. I say that it doesn’t take off. But I want the Mythbusters to prove it.
Update: Assuming a very long conveyor belt, about the length of the runway, the plane will take off. The wheels will spin freely, the plane’s wheels will be moving at 200 knots relative to the belt, the plane will be moving at 100 knots relative to the air and obeservers, it will move down the conveyor belt and take off.
Similar to the Monty Hall Problem, it is very difficult to sway someone away from their intuition. Many people online are trying to come up with the correct metaphor to convince people. Here is my attempt. First, do not picture a treadmill, rather a giant conveyor belt the length of two runways. Second, do not imagine the plane standing still, imagine it moving down the runway at normal speeds, but with the wheels turning at double speed. It can do this, because unlike a car that pushes against the ground to move forward, an airplane pushes against air. A propeller or jet essentially swims through air to gain propulsion. They must swim really fast because air is not very solid, but still that is how they work. The air the plane is in, is not moving, even thought the ground is, due to the conveyor belt. So the plane can swim through the air, moving down the conveyor belt no matter how fast it goes backwards, and create air movement over the wings. The wheels only have to spin twice as fast, and if they are well oiled, the increase in friction wouldn’t matter.
You will always be older than me.
I think this is my favorite picture of the two of us because 1.) We are thin, 2.) We are young, and 3.) Other than a few details, it could be any year from 1920 on.
…
The temperature of the water that sprays from the shower is the weighted average of the mixture of the hot and cold lines as they pass through the fixture. Everyone knows that you have to let the cold water run awhile, especially in the top floor of an old building, before it gets really cold. If the shower is the first thing turned on, this phenomena causes the shower to slowly get colder as time goes by. To compensate, I subconciously turn the heat up as the shower progresses. If you leave the faucet at high afterward, the next morning when it is turned on and the cold stream is really the lukewarm water in the pipes, the output could be scolding hot. Especially on the area between the knees and the navel where it first hits, especially, especially, certain places that are more precious than any other.
In short, I’m not having a very good day.
…
Site of the Day: The Case of the Plane and the Conveyor Belt. I say that it doesn’t take off. But I want the Mythbusters to prove it.
Update: Assuming a very long conveyor belt, about the length of the runway, the plane will take off. The wheels will spin freely, the plane’s wheels will be moving at 200 knots relative to the belt, the plane will be moving at 100 knots relative to the air and obeservers, it will move down the conveyor belt and take off.
Similar to the Monty Hall Problem, it is very difficult to sway someone away from their intuition. Many people online are trying to come up with the correct metaphor to convince people. Here is my attempt. First, do not picture a treadmill, rather a giant conveyor belt the length of two runways. Second, do not imagine the plane standing still, imagine it moving down the runway at normal speeds, but with the wheels turning at double speed. It can do this, because unlike a car that pushes against the ground to move forward, an airplane pushes against air. A propeller or jet essentially swims through air to gain propulsion. They must swim really fast because air is not very solid, but still that is how they work. The air the plane is in, is not moving, even thought the ground is, due to the conveyor belt. So the plane can swim through the air, moving down the conveyor belt no matter how fast it goes backwards, and create air movement over the wings. The wheels only have to spin twice as fast, and if they are well oiled, the increase in friction wouldn’t matter.