Sorry for being vague. I wrote 'highly focused' to give a picture where waves are projected into a constrained volume rather than outward in all directions. @hutchphd's image above wouldn't be that picture. I was thinking more of two beams directed at one another, oscillations exactly in...
Yes, a zero signal. The two oscillators are expending energy, putting it into a volume where no, or little, energy is observed, because of destructive interference. How does this concealment work?
Is that what those tags mean? I'm not even an undergraduate. I thought they were an indication of the level of the question (as though I would do better than a guess). I think the phase should be opposite that of the other oscillator to show the greatest effect.
When an oscillator produces waves - let's say they are highly focused - that are damped by a second negative phase oscillator, where is the wave energy? The energy in each set of waves must still exist. Has it become hidden?
I have read numerous times that the overall curvature of space in extremely large regions -1000s of megaparsecs say - is zero. I also keep reading that the expansion rate of the universe is increasing, and that the universe is resultantly positively curved. I would be interested in a...
If the points are stable today they were stable yesterday and they will be stable tomorrow. Gravitational perturbation can evaporate their contents, and one cannot know how long any object has been in an L4 or L5 point. I don't want to know the history of particular objects. I am interested in...
Some or all of the planets are thought to have migrated long ago under the gravitational influence of Jupiter. Would the trojan matter at their L4 and L5 points have followed during their migration to new orbits? In other words, while the L4 and L5 points are approaching or receding from the...
In the way I naively imagine a black hole's interior there are event horizons all the way down, and any material object of whatever size will straddle many event horizons. So, with both atoms and baryons, there cannot be any interaction between their components. Consequently, at the moment of...
Thanks for that. I have a way to go before I understand it. Is this the case? Free fall is not motion because a freely falling object feels no acceleration. Rest on the ground is motion because an object stationary on the ground is accelerating (and feels weight). Will you help me over a big...
What is the physical property that gravity has that enables it to make an object go faster or, if it is resting on the ground, have weight?
In General Relativity (as I understand it) objects in free fall move in geodesics. Thus an orbiting satellite moves in the curve around the planet that is...
To get closer to my puzzlement - in General Relativity (as I understand it) objects in free fall move in geodesics. Thus an orbiting satellite moves in the curve around the planet that is the geodesic for it given its velocity, etc. If it is in a circular orbit it does not gain or lose kinetic...
What is the physical property that gravity has that enables it to make an object go faster or, if it is resting on the ground, have weight?
That means it can do work: it gives objects kinetic energy. Where does that ability come from and where does the energy (the gravitational potential...
Can we make the assumptions that I want the spacecraft to have a main instrument chamber kept as cool as desired for a reasonably long time, and that it might be necessary to keep the craft with one side facing the sun (or a solution might require a rotation). So, to put numbers on it, if the...