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originally posted by: charlyv
The average voltage of a sine wave is 0.637 of the peak value. It is the same relationship with amperage. As far as power (wattage), .707 is the magic number due to reluctance, reactance and resistance.
It's more useful to talk about half a cycle because it's not as useful to talk about a "measurement" which is always zero, but that's the real average of the entire AC waveform, zero.
For a periodic waveform, the area above the horizontal axis is positive while the area below the horizontal axis is negative. The result is that the average or mean value of a symmetrical alternating quantity is zero because the area above the horizontal axis (the positive half cycle) is the same as the area below the axis (the negative half cycle) and cancel each other out in the sum of the two areas as a negative cancels a positive producing zero average voltage.
Then the average or mean value of a symmetrical alternating quantity, such as a sine wave, is the average value measured over only half a cycle since over a complete cycle the average value is zero regardless of the peak amplitude.
I'm glad you said this. If it has the same "alignment" as AC sine wave, then yes, it would be zero. What I am suggesting is that there may be forces the same as the 2 sides of the AC sine wave but what may change is where the zero point is located or if there are other factors that factor into the equation which generate a "positive" gravitational force.
originally posted by: TheRedneck
a reply to: DigginFoTroof
I'm glad you said this. If it has the same "alignment" as AC sine wave, then yes, it would be zero. What I am suggesting is that there may be forces the same as the 2 sides of the AC sine wave but what may change is where the zero point is located or if there are other factors that factor into the equation which generate a "positive" gravitational force.
The very definition of a sinusoidal wave places the zero-point line at exactly halfway between the alternating peaks. A naturally-occurring sine wave is created by oscillation of a field or particle(s) between the two extremes, with a central value summed over an entire cycle of zero.
If one wishes to change the zero-line, as in combine a DC voltage with an AC sinusoidal signal, the signal will ride the top of the DC voltage. The average result will still be the DC voltage, as the sine wave will still reduce to zero over a period of 2n*pi (full wavelength). Another poser pointed out the average value of 0.637 of the peak value, but that is the average magnitude, not the algebraic sum. RMS (root-mean-square) value will be 0.707 of the peak voltage.
In simple terms... one cannot have a sine wave with a zero-line anywhere except at zero. It ceases to be a sine wave and becomes something else, and that something else is very difficult to achieve, especially in nature.
TheRedneck
originally posted by: carpooler
a reply to: intrptr
A long time ago, I had a Prof. who specified that Isaac Newton originally described gravity, "as a force which acts as if at a distance". Most books leave out that very big "if". So then, Newton and Einstein were a lot closer together than is commonly thought. Or at least, that's what he lectured us on.
originally posted by: intrptr
originally posted by: carpooler
a reply to: intrptr
A long time ago, I had a Prof. who specified that Isaac Newton originally described gravity, "as a force which acts as if at a distance". Most books leave out that very big "if". So then, Newton and Einstein were a lot closer together than is commonly thought. Or at least, that's what he lectured us on.
Gravity acts more like a field, like magnets and Electromagnetic fields. Still, how do we explain the "Surface Tension" in the video?
originally posted by: intrptr
Gravity acts more like a field, like magnets and Electromagnetic fields. Still, how do we explain the "Surface Tension" in the video?
originally posted by: stormcell
originally posted by: intrptr
originally posted by: carpooler
a reply to: intrptr
A long time ago, I had a Prof. who specified that Isaac Newton originally described gravity, "as a force which acts as if at a distance". Most books leave out that very big "if". So then, Newton and Einstein were a lot closer together than is commonly thought. Or at least, that's what he lectured us on.
Gravity acts more like a field, like magnets and Electromagnetic fields. Still, how do we explain the "Surface Tension" in the video?
Surface tension is caused by the van-der-waals forces of the water molecules. Each molecule of H2O is slightly polarized in that there is a positive charge next to the hydrogen atoms and a negative charge around the Oxygen molecule. This makes the atoms want to stick together like syrup. Those molecules inside any blob have forces that are balanced and sum to zero. Those on the boundary surface have forces pulling them inwards.
I guess that's just how life is when you live in 3 spacelike dimensions and 1 timelike dimension.
The LIGO experiment is not measuring gravity, it's measuring distortions in space-time, called gravitational waves. Gravitational waves are not gravity, they are gravitational waves, something related to gravity, but not the same thing, so your statement isn't actually true. There are also "gravity waves" which are neither gravitational waves nor gravity, but even those do not show a wave-like nature of gravity, they the restoring force of gravity for things like planetary atmospheres, but the wave-like nature is manifested in the planetary atmosphere and no wave-like nature of gravity is needed to predict this effect.
originally posted by: Zelun
Gravity definitely does propagate as a wave at the speed of light. Evidence has been observed at the LIGO experiment
Gravitational waves are not gravity, they are gravitational waves, something related to gravity, but not the same thing