Quote from: SaltySpitoon on October 29, 2018, 08:54:14 PM

Quote from: joerogers8 on October 29, 2018, 08:16:43 PM

Whats up Slaty

How do you know it's the earth rotation which causes things to fall at that rate? I think we all agree that things fall at 9.81 m/s^2. That's the how. I think the why is being questioned. Is it the spinning earth or something else? I feel like we are getting caught up in the word gravity. The more appropriate question is can it be proven that things are falling at that rate due to earths spin?

I don't think you can just launch a weather balloon to see the curve. I have seen amateur footage that got to 120k feet. The horizon raised to eye level and was flat. I'm fairly certain you would need one hell of an elaborate setup to get to say double that height. I for one would love to see if we could get a balloon up higher than say 300k feet. Not sure if it would be high enough to see the curve or prove shape. I would love to see the proof in this fashion as it would seal the deal for humanity. I'm talking amateur scientists and enthusiasts replicating the experiment 1000's of times over not NASA or a govt space program.

How do you know the sun is a thermonuclear reaction and not something else?

It's the same basic issue with the pressure gradient. We know the pressure is there we can test it. Why is the pressure there? Can we prove it is the earths spin which allows us to have this pressure with no container?

Cool physics teacher and lesson here about air pressure. (ignore the flat earther comments and enjoy the video and science)
https://www.youtube.com/watch?v=spQ4d-0Q9-A

Well earth's rotation doesn't cause things to fall, earth is just an inertial reference frame for when that matters. Gravity is described as a force of attraction between any two objects with a distance between them and mass. Your chair is exerting a gravitational force on you, you are exerting a gravitational force on your dining table. As we talked about before, this force can be modeled by the equation F=-GMm/r^2 where G is that tiny constant, and M and m are the masses of the two objects, r is the distance between them. When we talk about gravitational forces, because G is 6.67x10^-11, the calculable force is essentially 0 if the product of your masses aren't on an order of magnitude to make up for multiplying by such a small constant, or if your radius is sufficiently large.

the moon, the sun, all of the other planets in the solar system, halie's comet, that 7-11 down the street, they all exert gravitational forces on you. However, 1) The moon/sun/other planets are far enough away that the force is negligible. The 7-11's mass is small enough that the force is negligible.

I didn't actually know the height you needed to be to witness the curvature of the earth, apparently the answer is just a little over 10km, and you can see it from an airplane on a relatively nice day. Thats just what a google search result yielded, so I wouldn't stake my life on it. But the answer should be easy enough to prove just by taking a look the next time you have a nice flight.

There are a lot of products from nuclear fusion that we get here on earth from the sun. Heat, light, EM and other types of radiation. The reaction on the sun is the same as the fusion reactions that we've created on earth. We can measure the products that are reaching the earth, such as light/heat, radiation/neutrinos, and observe the electromagnetic radiation that causes solar flares and other neat things.

"It's the same basic issue with the pressure gradient. We know the pressure is there we can test it. Why is the pressure there? Can we prove it is the earths spin which allows us to have this pressure with no container?"

Sorry if I'm misunderstanding, but where is there? We do have a container so to speak. Our container is the atmosphere around the earth. Various forces including gravity keep the atmosphere around the earth.

For the sake of transparency, I'm mostly working off of Newtonian physics. Newtonian physics is accurate enough to launch a space ship, but if you get a room full of physics nerds together, someone will mention that there are other factors in play. Newtonian physics still holds true, it'll get you 99.999% accurate results in almost all cases. When people wondered where the .001% error was coming from, that's when Modern physics with relativity comes into play. I don't mind including that, but it'd take a lot more time than I may need to if we are just talking about observable things.

What then causes this attraction if its not the spin?