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Traveling Downwind Faster Than Windspeed

vil says...

The best way I could think of to look at this is that the vehicle has very little mechanical drag so it accelerates to the speed of the wind, at which point it becomes static with respect to the wind speed, but the ground is essentially running back under it rotating the wheels ant thereby the propeller.

It still seems very counter-intuitive, unless there is a lot of inertia involved, that this would work so well.

The Most Popular Programming Languages - 1965/2020

Buttle says...

Assembler (for TI DSPs, embedded, no OS)
Scheme (a lisp)
C
Awk
would like to learn a logic programming language (eg Prolog), but have yet to get over starting inertia
will do some Fortran shortly for access to numerical libraries

ant said:

What are you guys using today if still programming?

Call Me A**hole One More Time

Payback says...

There's a theory Hancock's power is actually perfect, instinctual control over inertia. Adding and removing as needed, down to the molecular level.

Drachen_Jager said:

So... a human child can survive the gee forces involved in accelerating from 0 to 1000 MPH in about four feet?

Hmmm.

The Economic Collapse Of China! Signs Of China's Failing Eco

vil says...

China has enormous volume and inertia. Even if rich chinese stop getting richer quickly, there will be masses of poor chinese trying to make it out of poverty into the middle classes driving the world economy for decades to come. Unless something unexpected breaks down badly.

A trade war will hurt the US worse and faster, it just has more to lose.

Why You Should Never Ask Doug To Help

The Infinadeck Omnidirectional Treadmill - Smarter Every Day

ChaosEngine says...

Yeah, that was my thought too. Trackballs also solve the inertia problem too.

There's also a company called Virtuix, that solve the problem by having a bowl-like base with special slippery shoes. http://www.virtuix.com/

MilkmanDan said:

Very cool.

I sure would have thought that it would be a platform with hundreds of partially inset mouse/trackballs, rather than treadmills on axes 90 degrees apart. I mean ... sure, any 2D vector can be split into a sum of two orthogonal components. But with redundant inset trackballs you could get stuff like spot pivots that are much finer scale than the scale of the 2-3 inch wide secondary axis treads...

On the other hand, these guys actually have a working prototype, so they clearly thought things through and decided that the orthogonal treadmill solution was better. Rubber meats road trumps off-the-cuff theoretical any day!

Rotary Jails and Accidental Amputations

Shear Pins are Smart (They're Mechanical Fuses)

greatgooglymoogly says...

I don't think the inertia of the blades have anything to do with breaking the pin, rather the inertia of the motor/pto continuing to drive the shaft after the blades have seized. Same principle though.

Cement Truck Flips Over and Collides with Van

moonsammy says...

A ticket? I certainly hope it was a pretty severe one, as running a red light in a vehicle with that much inertia is a fair sight more significant than a typical passenger car. He very easily could've killed multiple people.

FedEx Driver drifting a Jackknifed Truck like a boss

bitterbug says...

Never did a stint as a commercial driver, but passed all the courses and went through down to the Michigan Decision Driving training grounds and did runs in trucks with jacknife scenarios, etc.

He's not drifting there. His trailer brakes are locked up. And because of inertia and ice his trailer is trying to pass his cab.

The goal is to maintain control but keep as low a speed as possible, so you give power to the cab to pull the trailer back into line in a normal situation. In this case he doesn't want to accelerate because there's no safe ground to regain control on, so he's going to aim for keeping the cab going at equal to or just slightly faster than the trailer.

As soon as he hits a clear patch of pavement or level ground then a little bit of acceleration from the cab pulls the trailer back in line behind the cab, drop the acceleration as the drag from the trailer slows you down, etc.

A good reason to always wait before pulling back in after passing a truck on the highway. In an emergency their maneuvers can take long distances when fully loaded. If something goes wrong during your passing maneuver your want to be as far out of their way as possible.

Detroit Lt. Arrested For DUI

Mordhaus says...

http://www.washtenawwatchdogs.com/wcso-lt-brian-filipiak-arrested-for-drunk-driving

http://www.washtenawwatchdogs.com/sheriff-lieutenant-brian-filipiak

This isn't the first time and the dude blew a .28 after the ride to the station and going through booking. That isn't a typo, literally over 1/4 of the blood in his body was actually alcohol. Death from alcohol poisoning can occur at .37 or higher.

The scary thing is that his tolerance must be massive, because he was still somewhat capable of speech and movement. Usually .25 to .30 level drinkers display general inertia, near total loss of motor functions, little response to stimuli, inability to stand or walk, vomiting, and incontinence.

The Bose Suspension In Action

Payback says...

The first thing you need to understand is the suspension doesn't use springs or shock absorbers. The whole thing is linear electric motors on each control arm. (Great huge solenoids) The suspension moves up and down independent of weight or inertia. It works fast enough that it starts to compensate for bumps BEFORE the tires hit the bump.

This system has more in common with a 1965 Impala with hydraulic rams bouncing in a parking lot than a conventional car suspension.

For the most part, it scans the road ahead.
See a dip down? Extend the wheel.
See a bump up? Retract the wheel.

I'm fairly certain the ollie was manually instigated by the driver.
Much like hitting the turbo boost on K.I.T.T. it's just a button and the computer does the jump.

Press button:
Retract the wheels, starting with the front. (to maximize suspension travel)
Push down hard on front, then rear wheels. (Launch car up)
Retract front then rear wheels. (tuck the wheels up)
*car passes over 2x4*
Push down on front, then rear wheels.(ready for touchdown)
*tires hit pavement*
Retract front, then rear, wheels slowly to absorb impact.

MilkmanDan said:

I'm very confused by that bit. Was that bunny hop activated by the driver (how?) or autonomous (and again, how)?

How Jumping In A Lake Launches a Ball Like A Rocket

newtboy says...

You've almost certainly got it with that. Displacement is enough to give the ball initial inertia in the right direction, then the "Rayleigh jet" or "Worthington jet" boosts it. It's perfect timing combined with a near perfect cannonball.
Think of the speed a splash goes skyward. If you accelerate something with more mass, especially something aerodynamic like a mini football to the same speed, it's going to shoot up like a rocket...which is what happened here.

eric3579 said:

I think it may be a combination of the two. I don't think if you just held the ball underwater a few feet it would launch that high when letting it go.
https://www.reddit.com/r/Physics/comments/41fpzm/water_shoots_ball_into_air/

I decided to ask in a science forum. Hopefully i can get some serious sciency explanation

Also made me think of this although dont know if it applies at all http://videosift.com/video/Stacked-Ball-Drop

Last Week Tonight with John Oliver - Migrants and Refugees

vil says...

Its not just about money. Integrating Muslim refugees (well mostly migrants) has proved to be difficult bordering on impossible in Europe. Ghettos, antisemitism, sectarian violence, attempts to impose islamic law on communities etc.

Nonetheless if a refugee asks for asylum in any EU country he will be given asylum in that country. Migrants are different, but since we do not have much of a mechanism for sending them back where they came from... not so very different.

Now some of these migrants and refugees that want to live in Germany and Sweden are supposed to be distributed by "quotas" among the other EU countries, how is that supposed to work in practice?

Dont get me wrong, we have hundreds of thousands of recently (within say 20 years) migrated foreigners in our country, but none of them are bitching about what I eat and drink, how often I pray or what my wife wears to the beach. So no big deal.

As long as these people get asylum and then get evaluated before getting citizenship and there is a limited number of citizenships available over a given period of time everything might yet work out fine.

It will not work out fine just by inertia and political correctness..

I would rather have one crazy polish fascist than a thousand people claiming to be syrian refugees come to my doorstep. I could deal with maybe five at most.

Soccer Kick Fail



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