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Cardboard Plane

jmd says...

Wow that guy made the video annoying to watch. It is a shame he hasn't watched other R/C planes, he might learn that those modern electric motors can generate so much thrust that the body wouldnt even be needed. You would have to try very very hard and add a ton of weight to make a battery powered plane that couldn't fly. And when I say fly I mean "dragged along by a horizontal helicopter blade".

Why Old Screens Make A High Pitched Noise

MilkmanDan says...

In the US, I believe that component in CRTs is called a "horizontal oscillator" instead of a "flyback transformer" (but could be that they are distinct yet related things). I've always been easily able to hear those, but am not usually bothered by them anymore since CRTs are fairly rare at this point. But this video proves that my 36 year old ears can still pick it up.

I feel like my hearing is bad -- I always want TVs louder than other people so I can make out what is being said, and in normal conversation it always seems like people are mumbling if there is any background noise at all. And I'm one of those annoying loud-talking Americans, especially if I'm talking on the phone (fortunately I don't get/answer many phone calls when I'm in public). But my hearing range pitch-wise seems to be exceptionally high, and not diminishing much with age (yet).

There's a fun easter egg for people like me at the end of that video. He put pulses of that CRT horizontal oscillator pitch where you can see the "Things You Might Know" text on the red background. I recognized it as Morse code, but couldn't decipher it even though I have an Amateur Radio license (I don't do code). In the comments at YT, people are claiming that the code translates to "never gonna give you up" -- so I guess he's Rickrolling people who both A) still have young enough ears to hear that 15kHz range *and* B) are old school enough to know / recognize Morse code. That's a pretty small target audience for an easter egg!

Earthquake Shake Table Rocks Buildings

greatgooglymoogly says...

buildings are designed and built to support the vertical loadn, with plenty of safety margin. I think any failure mode in an earthquake is going to come from horizontal movements.

4 Revolutionary Riddles

coolhund says...

1) Honey or similar liquid
2) Three times as fast.
3) Nowhere. If you pull hard, the wheel will spin, until the pedal is horizontal, then the bike will still not move (the back wheel will not turn).
4) Lower half of the wheels.

Huge wave breaks window at restaurant on pier

Unable to embed streamable.com and nba.com's videos? (Geek Talk Post)

ant says...

Oooh, good catch. I didn't even notice that very wide horizontal scrollbar. So, it did work. Not correctly.

@dag and @lucky760, a bug to fix? Also, you should give some updates on VS for 2017.

eric3579 said:

Your video is there but broke the sift kinda. Scroll to the far right.

alien_concept (Member Profile)

Driving home through the storm

kceaton1 says...

I drove right under the core of this thing going home. I could actually see a tornado being made and I checked all the weather and News outlets and there was nothing, except that NOAA decided to throw a Severe Thunderstorm Warning 10 minutes up AFTER IT PASSED...

It was so crazy to see a tornadic supercell in West Valley City (Salty Lake City, for most Sifters). It was following 2700 West for a bit and then I-215 (nearing the airport) was moving super fast to the NNE, straight to Washington Terrace and Riverdale. The winds were wild and the cloud formations were awesome, they were moving fast enough that I thought a partial nub might be visible where I was at, but I never did see it.

All that I saw was the main vortex with the amazing sight of all the cold air being sucked into the vortex at the SSW corner of the leading edge. Which was twisting more than fast enough to be a "horizontal twister". It was rotating so fast it was amazing; since you could see that sight you knew all it needed was a bit of air to push against it from underneath and stand up some of those vortices around the central core and then, walla, you'd get the tornado (I actually did believe that Ogden or Bountiful would get one since that was where it was heading).

All it needed was to get a little closer to the mountains and you'd have the right ingredients.

Thus, this is what you see happen right here in this video. North of my house, out in the middle of the Great Salt Lake, sits Antelope Island. It got hit by the raining part of this tornadic system but look at this wonderful storm video from it:

https://twitter.com/AntelopeSP/status/779078436568518656

It even had some golf ball hail in it.

Thwarting An Attempted Darwin Award Winner

poolcleaner says...

It's more natural to hold a phone in portrait (vertical) than in landscape (horizontal). Typically landscape requires 2 hands -- and if filming landscape with one hand, it becomes easy to lose grip.

I know it ruins the cinematic quality, but he didn't film the dude for our entertainment, he filmed it as proof.

It's also a logistical issue, as it is easier to grip a phone vertically than horizontally. This is the reason why there are so many videos filmed in this mode. Especially in situations where people are unable to use both of their hands to stabilize the video, such as running, when in danger, or at the top of a bridge...

Also, his subject is a human which stands upright, so filming vertical allows him to distribute his subject matter across the entire canvas; whereas landscape would cut off the primary focus and distribute the background on either side of the subject, which is unimportant to the situation, in place of filming the man from head to toe in a single frame.

PlayhousePals said:

stop stop stop ...Fuck me ... vertical video warning mate! Bloody hell

US Navy SEALs Combat Swim

chicchorea says...

Wikipedia
"The combat side stroke is a relaxing and very efficient swim stroke that is an updated version of the traditional sidestroke. The CSS is a mix of sidestroke, freestyle and breaststroke. The combat side stroke allows the swimmer to swim more efficiently and reduce the body's profile in the water in order to be less likely to be seen during combat operations if surface swimming is required. The concept of CSS has been that it can be used with or without wearing swim fins (flippers), the only difference being that when wearing swim fins the swimmer's legs will always be kicking in the regular flutter kick motion without the scissor kick. This stroke is one of the strokes that can be used for prospective SEAL candidates in the SEAL physical screening test (PST), which includes a 500-yard swim in 12 minutes 30 seconds to determine if the candidate is suitable to go to the Basic Underwater Demolitions/SEAL school.

Basics

The combat side stroke utilizes the three main fundamentals of swimming:

Balance: There are two things that affect your balance in the water - the head and lungs. Most people when swimming, especially when using breaststroke, will swim with their head up[citation needed] which forces their hips to sink down which is like they are swimming uphill and is a sign of being less comfortable. However, if the body is flat/horizontal or more parallel to the water-line it is far more effective and will allow the swimmer to feel more comfortable in the water.
Length: The taller the person is, the faster the speed through the water. As a result, it is important that the swimmer is fully stretched horizontally in the water, as this will reduce the body's drag through the water and allow a higher speed.
Rotation: In most sports, such as baseball, when the batter swings the baseball bat they will rotate the hips to increase the power of the swing. The same principle is applied to swimming. If the swimmer engages the hips and uses the body's core muscles it will increase power."

You rather nailed it.

SFOGuy said:

Clueless question; this style of swimming because it's really energy efficient? Because it makes less wake and is stealthier? Because it's harder to hit someone swimming like this in the water with gunfire?

Sorry, I'm not sure why they settled on this stroke...He says faster and more efficient---but---any engineers/biomechanics/hydrodynamics folks who tell tell me why?

Mississippi River Hydrostatic Model

oblio70 says...

"Years earlier, they had amassed...", before building the model.

The model came later as a result of the failed projects, realizing that a symptomatic approach was flawed. The model was to take a more holistic methodology to addressing the flooding along the Mississippi.

The timeline is as follows:
the Great Mississippi Flood of 1927:
Flood Control act of 1928-
Army Corps of Engineers gets to work
Sec. of Commerce H.Hoover directs Flood Relief
towns & cities which had flooded get levees
The Great Flood of 1937:
towns downstream of newly protected communities get flooded.
ACE begins with simple models in dirt
1943 gets funding to build largest scale model for study:
1"=1000' horizontal, 1"=100' vertical
German POWs used for initial labor.

sorry that wasn't clear enough before. There was no model before.

SFOGuy said:

... The way you wrote this---implies to me that they either misunderstood the model or the the model gave them flawed data. Or perhaps, that they got good data and ignored it (lol). I'm curious: which was it?

Primitive Technology: Forge Blower

Slipknot on why they wear masks

hazmat22 says...

Touche, I shouldn't have left GWAR out, although I still haven't seem them live technically. They were rained out this summer at Riot Fest and all we got was a ton of fake blood shot out over everyone and a brief glimpse of their costumes. I think their equipment was probably damaged even, it went from dry as their set started to a torrential downpour traveling horizontal in seconds.

Kiss was a little before my time, so I haven't had the urge to go see them live, although I do enjoy their music and influence.

My list was only bands I've seen live =P

newtboy said:

I like them, but I'm disappointed there's no honorable mention of GWAR, or even KISS as an inspiration.
They are far from the first masked metal band.

Solving By Using 'Extreme Case' Puzzles With Physics Girl

robbersdog49 says...

Problem 1: Tip toward the wood, as the wood will lose more buoyancy from the air than the lead.

As for the extreme case here, let's use the helium balloon. You tie the helium balloon to the right hand side of the scale. Now, to get the bar on the scale horizontal (balanced) you need to hang the lead weight closer to the fulcrum but on the right hand side of the scale too.

Now remove the air.

The balloon was only pulling up because of the air. Without the air it will hang down. So, we now have two things hanging down on the same side of the scale, so it's very obvious which way the scale will swing...

Problem 2: pi*20m Circumference = pi*diameter. Poles increase diameter by 20m. Really not sure where the 'extreme case' comes into this though?

Stormsinger said:

Beats the hell out of me.

Just to noodle around a bit, the only extreme I can think of about the scales would be to substitute an extremely low density object for the wood. Say, a helium filled balloon? But that assumes that she did in fact mean equal mass for the two objects, and wouldn't actually give valid readings on a scale in atmosphere anyway.

Extreme cases are a rather specialized approach, as I remember...its not really a common, or easy way to get answers. I got the feeling this was kind of a "wannabee" presentation. Like she wanted to do "Smarter every day" stuff but isn't quite able to find and explain interesting non-intuitive problems well.

How to ... Easy Optical Illusions

lucky760 says...

Some were... okay, but some were... huh?

Create an invisible triangle? Really?

Flip the eyes and mouth over and it will look weird... ohhhh kay...?

When "wow" flips horizontally it still says "wow." Wow, quite a revelation.

This could only have been created for children. That's the only thing I can imagine.



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