tech99's latest activity

For the case of a standing wave, there is no net flow of energy - the energy is stored. The electric and magnetic fields are no longer...

I think what is being described is a zone plate.

Is not the shape of the field simply the superposition at every point of radial fields from more than one body? This gives the curvature.

There is an excellent book called Tuning for Speed by Phil Irving.

I think the view is that small events occurred and there was insufficient stored energy in the system to cope with it, so more rotating...

I think my own method here is to work with an electrical analogy. (Of course, it is only my familiarity with electricity which makes me...

Wind will exert a force even on a static object, due to the change in momentum of the air particles, so no flow past the door is...

I was being conservative in the opposite direction to you. For 1 gram = 1 ml = 1 cc resolution, neither 1 in 3x105, nor 1 in 2x106 is...

When you dip anything into the tank, it has upthrust due to its displacement volume. If you hold the object rigid, then there is an...

All that is necessary to obtain the volume is to put the tank on a balance. No need for an overflow of any sort. Push the antlers down...

I have noticed that on a small scale, many metals will allow re-charging, including Aluminium in alkali conditions.

Great! That's what this forum is for. Refreshing change from those who come here to argue that they can, or already have, broken the...

A child could insert a metal object. Why not have a shutter to close the live terminal, as in the UK plug system?

I noticed a contractor making a big mistake whilst tensioning the supporting guys (or stays) of a big radio mast. To do this they placed...

You can buy a portable compass/sundial here...