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The curvature of the earth doesn't "back away", it's the shape it is, and "back away" implies some kind of movement. The Earth's rotation is once per 24 hours and the spacecraft might complete an orbit once every 90 minutes so it's fair to say motion of the spacecraft exceeds that of the Earth.
originally posted by: Nochzwei
Thanks for your reply. However the balance of centrifugal and centripetal force is not what keeps the space craft in orbit. The spacecraft is continuously falling towards the earth at the orbital speed, but the curvature of the earth backs away, and this is what keeps the craft in orbit. Though this leads me to another ques, how do they get robotic craft to orbit an asteroid, whose gravity in miniscule?
The Nobel prizes have been awarded for 114 years, and if you examine the history of peer review, it became much more widespread by the middle of the 20th century, which is only 64 years ago, so there's about 50 years before that where peer review was still spreading from medicine into other sciences.
I remember mary rose posting somewhere that nobel prizes have been awarded to non peer reviewed sciences, but cannot tell you offhand which ones. Maybe she will chime in here. If what she says is true then peer review by and large a dogma keeping entity.
So this has not much to do with Nobel committees acumen as it does with what practices were widespread during the relevant time period.
Peer review gradually become a standard feature of medical science but did not penetrate widely into science and academics until the 20th Century, becoming a regular institution by the middle of the century.
I don't know, are you?
originally posted by: cloaked4u
am i making this up.
Neither do I. The one part I did understand of your question was "pulsed magnetic field inside switching poles from north to south at a high velocity ,frequency", well velocity is usually about the speed of light in a vacuum or slightly less in air, but frequency of AC electricity you use at home is low, like 50/60 Hz in the UK/US. The electrons wiggle back and forth in power lines so their direction changes at the same frequency 50/60 Hz.
Is this physics, i have no idea.
Actually gravity has very little to do with that experiment, in fact it's performed in a microgravity environment to minimize the effects of gravity from Earth. There are gravitational forces between the water molecules, but since gravitational forces are about 100000000000000000000000000000000000000 times weaker than electromagnetic forces on small scales, what you are actually seeing with the water having a spherical shape has more to do with the electromagnetic forces between water molecules which create an effect known as "surface tension". This is the result of water molecules having an electric dipole, as explained on this NASA site about surface tension:
originally posted by: cloaked4u
What happens when you blow a bubble into a water sphere and spin the sphere in space ? Does it A: Bubble inside water gets pulled to outside of water sphere. OR B: Bubble inside gets pulled to center of inside water sphere. OR C: you cannot blow a bubble in a water sphere in space. Knowing this answer is part of the key to gravity on earth and in space.
The shape of a water drop is a result of surface tension. Water is composed of molecules consisting of two hydrogen atoms and one atom of oxygen. These molecules attract each other. In the middle of a drop of water, molecules attract each other in all directions so no direction is preferred. On the surface, however, molecules are attracted across the surface and inward. This causes the water to try to pull itself into a shape that has the least surface area possible-the sphere.
Lol, you do have some failing with the English language. I never implied any movement when I said curvature.
originally posted by: Arbitrageur
The curvature of the earth doesn't "back away", it's the shape it is, and "back away" implies some kind of movement. The Earth's rotation is once per 24 hours and the spacecraft might complete an orbit once every 90 minutes so it's fair to say motion of the spacecraft exceeds that of the Earth.
originally posted by: Nochzwei
Thanks for your reply. However the balance of centrifugal and centripetal force is not what keeps the space craft in orbit. The spacecraft is continuously falling towards the earth at the orbital speed, but the curvature of the earth backs away, and this is what keeps the craft in orbit. Though this leads me to another ques, how do they get robotic craft to orbit an asteroid, whose gravity in miniscule?
Also it seems you are denying a concept you don't understand, when you say "the balance of centrifugal and centripetal force is not what keeps the space craft in orbit" because you than go on to provide essentially the same explanation, but you call it "falling", perhaps because you don't know that's the result of the "centripetal" acceleration due to gravity.
Thus I can also suspect your denial of relativity is likewise based on not fully understanding what it is you're denying.
originally posted by: Nochzwei
Read my above post, the answers are there. Again nothing to do with centrifugal or centripetal force in a free fall.
a reply to: dragonridr
originally posted by: dragonridr
Gravity provides the centripetal force causing it to move in a circular path while there speed causes centrifugal force trying to move them further out into space. The balance between the two makes the astronauts feel like there is no gravity. But they feel the same amount of gravity you do for the most part there really not that far out into space.
Those are the same thing. Centripetal acceleration of a spacecraft in orbit is the result of the gravitational interaction.
originally posted by: Nochzwei
What makes the spacecraft fall towards the earth is g ( same as in a vertical fall ) and not centripetal accel.
A spacecraft enters orbit when it has enough horizontal velocity for its centripetal acceleration due to gravity to be less than or equal to the centrifugal acceleration due to the horizontal component of its velocity.
Heck that quote of yours is all rubbish. Ever wonder why you feel the centrifugal force in a merry go round?
originally posted by: Arbitrageur
Those are the same thing. Centripetal acceleration of a spacecraft in orbit is the result of the gravitational interaction.
originally posted by: Nochzwei
What makes the spacecraft fall towards the earth is g ( same as in a vertical fall ) and not centripetal accel.
Earth orbit
A spacecraft enters orbit when it has enough horizontal velocity for its centripetal acceleration due to gravity to be less than or equal to the centrifugal acceleration due to the horizontal component of its velocity.
originally posted by: KrzYma
QUESTION
how can it be, that by a collision of electron and positron ( anti electron ) an muon and anti muon are created ??
starts at 11:20 of this video
originally posted by: EasyPleaseMe
originally posted by: KrzYma
QUESTION
how can it be, that by a collision of electron and positron ( anti electron ) an muon and anti muon are created ??
starts at 11:20 of this video
The extra energy to create anything other than gamma comes from kinetic energy. Gammas are produced at rest. This fact makes particle accelerators useful.
Muons were discovered by Carl D. Anderson and Seth Neddermeyer at Caltech in 1936, while studying cosmic radiation. Anderson had noticed particles that curved differently from electrons and other known particles when passed through a magnetic field. They were negatively charged but curved less sharply than electrons, but more sharply than protons, for particles of the same velocity. It was assumed that the magnitude of their negative electric charge was equal to that of the electron, and so to account for the difference in curvature,
it was supposed that their mass was greater than an electron but smaller than a proton.
The muon is an unstable subatomic particle with a mean lifetime of 2.2 µs.