Comments by "Scott Wallace" (@therealzilch) on "Johnny Harris"
channel.
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Motion without acceleration is relative. It cannot be felt or detected, and indeed doesn't really exist, except relatively. Acceleration, in the physics sense here, means speeding up, slowing down, or moving in a curve. Earthquakes cause a great deal of acceleration, because objects are sped up, slowed down, and moved in curves. The rotation of the Earth does cause acceleration, because it moves us in a curve, but as the others here have pointed out, it's very little acceleration, and it's constant. So we can't feel it- we can, however, detect its effects, because it causes the Coriolis force, the Eötvös effect, precesses Foucault pendulums, and makes objects at the Equator weigh about 0.3% less at the Equator than at the Poles.
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@larebear1902 Hey again, you probably don't remember me, but we've chatted before. It's been explained very nicely above. I'll try a different tack.
You probably know that the water pressure deep in the ocean is very high. So why does this pressure not push up to the surface and shoot the water into the sky? Why don't we feel this pressure when we swim at the top? There's no pressure there at all, is there (other than the atmospheric pressure that we always feel at sea level)? That's because the pressure deep below is caused by the weight of all the water above. At the surface, there's no weight of water above, so there's no pressure to shoot the water up.
Same goes for the ocean of air above us. At the bottom, at sea level, we have all that weight above us, which means we have a pressure of about 14.5 psi on us. As we ascend, in a balloon or climbing a mountain, there's less and less air above us pressing on us, and the pressure goes down. Eventually, the amount of air above us, and thus the pressure on us, grows to be practically nil. At that point, we can call it a vacuum for all practical purposes, and there's nothing pressing either us or the air molecules to move anywhere.
I hope that helped. Cheers from sunny Vienna, Scott
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@larebear1902 No, you didn't answer that. You just claimed that gravity is only a "number on paper". But sure, I'll try to answer.
You ask, How can gas be pulled by gravity into a ball within an extreme vacuum?
Because gravity is a force that pulls, and vacuum is nothing, no mass, no force. Air will only fill a vacuum if its own pressure pushes it into the vacuum. Air has mass and is thus pulled by gravity. If the pressure of the air is not strong enough to counter the pull of gravity, then the air stays on the ball, our Earth. And as we know, atmospheric pressure drops with altitude, so eventually the pressure is not strong enough to allow the air to escape gravity.
And no vacuum is "extreme", since a vacuum is just nothing. It's just space with zero pressure.
I read through the comments and I can't find where you explained why air pressure reduces with elevation. Nor could I find an answer for what you call the force that pulls us down. You must have an explanation for this force, right? And an explanation why things fall down, not up, sideways, or not at all. I have an explanation for all this: gravity fits the observations. What's your explanation?
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@SolaScriptura1483 No, I cannot prove that the Sun is 93,000,000 miles away, because I don't have the equipment. If you want to know how it was done, you can search "distance to Sun history" and find all the details, which are quite complex and beyond the scope of a YouTube comment. I assume you have a high school level of trigonometry.
But the actual distance to the Sun is irrelevant for showing that the Earth is a globe and that it orbits the Sun. What can easily be ascertained is that the Sun must be quite far away, much further than flat Earthers claim, because of perspective (the Sun does not change size noticeably during the day) and its constant speed of 15 degrees per hour across the sky, at all times and from all places, which also rules out a close Sun.
The ancient Greeks knew that the Earth is a globe and also that the Sun must be distant (although their estimates were way off), but they thought the Sun orbited the Earth. But the thing is this: motion is relative. Barring other information, one could say the Sun is orbiting the Earth, or the Earth is orbiting the Sun. But we do have (since the mid-1800s) other information, in the form of stellar parallax, which shows the apparent change in position of stars caused by the Earth tracing its 186,000,000 mile circle every year. And we have direct physical evidence of the Earth's rotation about its axis, in the form of Foucault pendulums, the Eötvös effect, and the fact that things weigh less at the Equator than at the Poles.
You said that sunsets prove the Earth is flat. How do you reckon that? On a flat Earth, there would always be a clear line of sight to the Sun.
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