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ArishMell · 70-79, M
A dead "flat" surface of still water is curved, simply by being on a spherical planet, though it has to be a large expanse for the curvature to be noticeable (the horizon).
The ocean surfaces are also bulged by the passage of the Moon above them, causing the tides.
The ocean surfaces are also bulged by the passage of the Moon above them, causing the tides.
TBIman · 41-45, M
@ArishMell How can something "dead flat" be curved as well? So the moon (that light in our night sky) is somehow capable of moving trillions of tons of water? I'd just love to hear how this amazing feat is accomplished. You cannot use the unproven THEORY of gravity to explain how something much smaller than the Earth has the power to move such a large amount of water without ever even touching it.
ArishMell · 70-79, M
@TBIman "Unproven"... so if you drop something, how does it arrive on the floor and not just float in the air?
Sorry, but I don't understand why you asked a straight question of simple science, then accuse anyone who has the courtesy to give you a straight and simple explanation of being liars or mentally-ill - and ironically, to do so via systems that can exist only thanks also to the Laws of Physics.
Of course the surface of water is "flat" for all practical purposes over a small area, but it does follow the curvature of the Earth over a large area like very big lakes and the seas. Hence the horizon.
I am aware there are "flat-Earth" believers, but you have not said you are one.
That the Moon and to some extent the Sun cause the tides has been observed for centuries - though it took the discovery of the Laws of Gravity and developments in Physical Geography to explain how.
Sorry, but I don't understand why you asked a straight question of simple science, then accuse anyone who has the courtesy to give you a straight and simple explanation of being liars or mentally-ill - and ironically, to do so via systems that can exist only thanks also to the Laws of Physics.
Of course the surface of water is "flat" for all practical purposes over a small area, but it does follow the curvature of the Earth over a large area like very big lakes and the seas. Hence the horizon.
I am aware there are "flat-Earth" believers, but you have not said you are one.
That the Moon and to some extent the Sun cause the tides has been observed for centuries - though it took the discovery of the Laws of Gravity and developments in Physical Geography to explain how.
ArishMell · 70-79, M
@TBIman "Weight" is a function of gravity and mass, which is why an astronaut in Space is "weightless" but is still all there and complete so still has "mass"!
The word "fall" is merely our name for the direction and motion; but it is always towards the centre of mass big enough to have sufficient to have a significant level of that attractive force called gravity. So on Earth, towards the centre of the Earth.
What gravity itself actually is, is still a puzzle the quantum-physicists are trying to solve, but you cannot deny its existence.
The word "fall" is merely our name for the direction and motion; but it is always towards the centre of mass big enough to have sufficient to have a significant level of that attractive force called gravity. So on Earth, towards the centre of the Earth.
What gravity itself actually is, is still a puzzle the quantum-physicists are trying to solve, but you cannot deny its existence.
ArishMell · 70-79, M
@TBIman Density = mass per unit volume.
Weight (scientific. not colloquial, use) = mass X acceleration due to gravity at the particular location. That is why the "weight" of any given object is so much less on the Moon than on Earth, and non-existent for practical purposes in Space.
Why are you so determined that gravity does not exist?
What then, in your view, explains the attraction between masses that (if big enough) tends to draw them together?
What stops unrestrained objects drifting off in any direction instead of towards the centre of the Earth, keeps the seas on the Earth, the Moon orbiting the Earth, the planets orbiting the Sun, etc., etc.?
Why is it necessary to use such powerful rockets to send comparatively small loads into Space, accelerating them to about 7 miles /second (>25 000mph)?
Weight (scientific. not colloquial, use) = mass X acceleration due to gravity at the particular location. That is why the "weight" of any given object is so much less on the Moon than on Earth, and non-existent for practical purposes in Space.
Why are you so determined that gravity does not exist?
What then, in your view, explains the attraction between masses that (if big enough) tends to draw them together?
What stops unrestrained objects drifting off in any direction instead of towards the centre of the Earth, keeps the seas on the Earth, the Moon orbiting the Earth, the planets orbiting the Sun, etc., etc.?
Why is it necessary to use such powerful rockets to send comparatively small loads into Space, accelerating them to about 7 miles /second (>25 000mph)?
ArishMell · 70-79, M
@TBIman Gravity is not mass alone, and its true nature is still enigmatic; but what is clear is that mass controls the body's gravitational attraction.
The greater the mass - and it does have to be "greater" on geological and astronomical scales to be significant the greater the attraction.
Examples? I have already given them: the Moon orbiting the Earth, the Earth orbiting the Sun. Come to that, our Solar System gracefully orbiting the centre of the Galaxy. Or do you deny these happen?
As for "sticking to", nothing actually adheres, but drop a brick and it will stop when it hits the ground with a thud. It won't fly up, up and away.
You have not answered though [i]why [/i]you are determined to deny that whatever the force is, gravity does not exist! Just make sure your toe in not under that dropped brick.
The greater the mass - and it does have to be "greater" on geological and astronomical scales to be significant the greater the attraction.
Examples? I have already given them: the Moon orbiting the Earth, the Earth orbiting the Sun. Come to that, our Solar System gracefully orbiting the centre of the Galaxy. Or do you deny these happen?
As for "sticking to", nothing actually adheres, but drop a brick and it will stop when it hits the ground with a thud. It won't fly up, up and away.
You have not answered though [i]why [/i]you are determined to deny that whatever the force is, gravity does not exist! Just make sure your toe in not under that dropped brick.