This is a physics question that international universities always ask physics students. In reality, tunneling to travel through the center of the Earth is impossible. At least not yet with current technology.
Leave it. To answer this question, let’s first assume that we already have the technology to drill a completely straight tunnel through the core of the world and fall straight down. Also, let’s say that the wall of this tunnel is strong enough to not collapse. And in this tunnel, there is absolutely no air resistance to prevent an object from falling at speed. Also, let’s say that it can completely defend itself against the heat inside the world (if it weren’t for milk, it would have already burned once).
Suppose a person falls down the other side of this tunnel. What will happen to him? A day in the middle of the world? Will it fall back from the other side? How long will it take to come out the other side?
Now it’s long. come Let’s jump together. I have jumped.
So before jumping in, this kind of tunnel has been given a beautiful name in physics. “Gravity Train: This is a train that will travel only by the world’s gravity. That’s why this name was chosen.
From the time you jump until you reach the center of the earth, the gravity of the earth is acting on the person falling, so the person falling will be falling down with the speed of this gravity. As soon as he crossed the middle of the world, this man was no longer falling. He was now climbing back to the surface of the world from the other side of the tunnel.
The gravity of the earth is 9.8 meters per second. This means that if you fall to the earth, your speed will increase by 9.8 meters every second. The longer you fall, the faster your speed will be. By the time you reach the center of the world, your speed has increased to 18,000 miles per hour.
So here comes a question. The world’s gravity pulls him down, so how can this man kick gravity and come back to earth? This is where Newton’s second law of momentum comes in. What Newton said is that things that are moving have a desire to keep going, and things that are stationary have a desire to stay still.
To show this as an example, when you ride a motorcycle, even if you stop, if you leave the gear free, the motorcycle continues to travel a long distance at its own speed, right? This makes sense. The person who fell at the speed of the earth continues at his own speed until he crosses the center of the earth, so he can defy gravity and rise back up to the other side of the earth’s surface.
What you need to know here is that the closer you get to the center when you’re falling, the faster you get. Because it is falling in the same direction as the Earth’s gravity. Once we pass the center of the Earth, the Earth will pull in the opposite direction (downward) while we are heading towards the Earth’s surface. Therefore, our speed will gradually slow down.
How long will it slow down until it reaches the surface of the earth on the other side of the world? The unfortunate thing is that once it stops, it falls back into this pit. After that, we will go back the way we originally came and come back to the hole where we originally jumped. If the children were swinging in the playground, we would be going from side to side of the hole non-stop, just like the side swings from side to side. There is no air resistance to slow it down, so it will keep going as long as someone doesn’t grab it from the mouth of the hole.
Physicists originally calculated that it would take 42 minutes to get from one side of the world to the other. It takes 21 minutes to reach the center from the surface of the earth and 21 minutes from the center to the other side. The problem with this calculation is that it assumes that the Earth’s gravity is equal everywhere.