tube

Now, try to get the magnet out without cutting the tube.

It's missing the point, Elon Musk said explicitly that it's not evacuated tube.

I got the idea that tube distortion and movement is taken into account into the system.

So far so good--at least this comports with vacuum tube conventions, which will be familiar to all readers of Hacker News.

When I was in 8th grade I did an experiment that found that mold grew better nearer a cathode ray tube computer monitor.

Talking about tens of thousandths of an inch tolerances on a 10' diameter tube is not to be dismissed lightly.

Do you really think the special interests that are making HSR so difficult and expensive would say, "Oh, do whatever you like with your tube.

The experimenter picks drops the 100g magnet into the tube once per second and that it has zero velocity at the tube exit.

I can gaurentee that we can build concrete pylons capable of holding up a steel tube, that is done all over the country dozens of different uses cases.

There is an insinuated connection between Musk's Hyperloop plan and the company ET3 and their evacuated tube design, but there is none.

Then, despite the fact that bicycles have existed for a hundred years, they got patents on things like "using levers to shift" and "building a frame out of tube-like structures".

They determined that the patient suffered a collapsed lung, so they made an incision in her chest, and used a coat hanger, brandy, and a tube from a medical kit to drain the lung.

But can we build a multi-hundred mile long steel tube to the required tolerances?I would be inclined to trade off efficiency for manufacturability.

The point is that as the magnet is falling through the copper tube it creates an electric current which then creates a magnetic field in the opposite direction of the magnet's movement.

I would image the tubes will be joined with automated friction stir welding or something similiar, but that will still require a fair amount of post weld machining which has its own pitfalls.

I may be naive here, but the pylons really do take away most of the objections from farmers and installing tubes over farmland has to be a lot cheaper than doing construction above a highway.

What about the London tube/bus suicide bombings: those were domestic terrorism and elicited a distinctly different response than we're seeing in Norway now. Or is it only domestic terrorism when the perpetrators are white one wonders!

It's interesting that the biggest line item in the costing is not the tube, nor the capsules, nor the vacuum pumps, nor the solar panels, nor the land, but the concrete pylons that support the tube - about two-fifths of the total.

I can see it now: Londoners huddled outside of the barred-up tube entrances in the rain, moaning privately to themselves about the lack of transportation, until one clever sod whips out his smartphone and announces, "Uber will give us 50% off if we split!

As sperm travels in this coated tube, the ionic attraction causes damage on a cellular level in the sperm, the pull effect effectively destroying the sperm "tail" and preventing it from fertilizing a female but without hormonal/medical methods!For me, as an engineer, this was a true revelation.