swansont

That's a rather egregious abuse of significant digits you've got there.

It would be nice if you could vary the weight of feedback you give. Some posts are good but not great, and some are bad but not terrible. But if the system assigns the same point value for any recommendation (from a given user), you can't make that distinction.

1. This sounds a bit like Zeno's paradox. (aka Xeno, and there are actually several paradoxes) 2. Space and time are thought to be quantized, or at least current theories can't deal with them at some small scale. These are the Planck length (~1.6 x 10-35 m) and the Planck time (~10-43 s).

Note that solid-on-solid tends to have a lot of small air gaps, which end up being good insulators. You need to add some thermal grease or thermal epoxy (a thin layer) to get cood conduction.

If they are travelling waves, yes. But in a container, they can form standing waves which means there will be nodes, where the energy is a minimum. The rotating plate is there so the food doesn't stay in the nodeand helps even out the cooking. So it would be harder for the ant to stay inor near a node, but not impossible.

Newton's third law states that every force has a reaction. That is, FA-B = FB-A. A exerts the same force on B that B exerts on A. But thrust and drag are both exerted on the plane - the same object. The reaction force to either has to be a force that the plane exerts on the air.

Drag isn't the reaction force to the thrust. Thrust action/reaction is the force the propeller exerts on the air passing through it, and the force the air exerts on the propeller. Drag action/reaction is the force the plane exerts on the air by moving through it, and the force the air exerts on the whole plane. You can have thrust with no drag (e.g. plane bolted down with the prop running) and drag with no thrust (e.g. a glider).

Perhaps you've noticed that microwaving gives you hot spots and cold spots - that's due to constructive and destructive interference of the microwaves. That's why some more expensive ovens have a turntable or "stirrer" - it minimizes the extrema. I'm guessing you don't have one of these. When you microwave for several minutes, some of the cold spots may warm up by conduction with adjacent food, but it's still a null of microwave energy. So the ant probably just found a cold spot and camped out there. Ants can be small compared to the wavelength - 2.4 GHz is a little over 10 cm. Neither your food nor the ant became radioactive - there's an important distinction between that and being irradiated. Microwaves don't ionize, so heating is the main effect. Most legitimate concerns of microwaving (e.g. loss of nutrition) stem from local overheating and the chemistry that happens when food gets really hot; the fact that microwaves cause the heating is incidental.

Air resistance and friction are macroscopic phemomena. Atoms are mostly empty space, and a photon has the ability to pass through without interacting. If the photon does interact, it will either be absorbed or it will scatter. No more photon for the former, different energy photon, but travelling at the same speed, for the latter.

Well, not quite. There are radiactive isotopes of lead, and I think some decay chains go through these. But they beta decay to Bismuth and then to Polonium before alpha decaying to a different isotope of lead. Eventually it ends up as a stable isotope of lead.

The peak is near iron, at about 60 nucleons. Heavy elements decay toward iron, they just stop at lead. Lead has a filled shell of protons (82) and one isotope also has a filled shell of neutrons (126), which helps explain why it ceases to be energetically favorable at that point. And if you can't release energy, it won't happen spontaneously.

No. Gravity at a radius R is dependent on the mass inside of R (for a uniform distribution). A torus has no mass inside, thus no gravity to hold it together. You might end up with a smaller planet that has rings, but that would depend on a lot of things.

No, the isotopes of lead that are used are generally not radioactive. That would kinda defeat the purpose of using it as shielding. Heavier elements which are radioactive eventually end up as an isotope of lead via the alpha and beta minus decays that occur along the decay chain. Once they become a stable isotope of lead, they stop decaying (by definition, stable isotopes don't decay)

Your units don't work, so the answer can't be right. You want an electrostatic force equal to the weight. F=qE is the electrostatic force F=mg is the weight. Set them equal and solve for E (note that there is no need to solve for F)

This might be of help. Note the dropdown menu at the top. And you might look at this as well.

No, I'm a physicist. (a physician is a medical doctor)

I'm not aware of any evidence that it does, and there's plenty to suggest that it doesn't, as theory predicts.

Yes, although laser cooling can do lots of other things - lots of investigations into gases where the atoms move slowly. Cold collisions, atomic clocks, trapping radioactives for nuclear investigations, atom optics (atoms moving slowly have an appreciable deBroglie wavelength) Here is a list of labs around the world that do atom traps. Fairly complete for research labs, I expect, but there are undoubtedly a few omissions. This is a fun java applet that demonstrates evaporative cooling.

If light enters a medium with index >1 it slows down, and if it hits something it scatters. But within a medium of constant index, the speed is a constant. Space is a vacuum of moderate quality, so photons can make it quite far without hitting anything. There is nothing like friction to act on light.