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ib9rt
subscribed to DeepSkyVideos
2 weeks ago
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ib9rt
commented
1 month ago
Vortex Nitron - Sixty Symbols
Just a bit of fun for Christmas - we "physics review" one of this year's hot Christmas gifts.
No product endorsement (in fact it looks a bit "naff...
@KamekoBruns But to the best of my knowledge the good professor is not from the UK...
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ib9rt
commented
1 month ago
Vortex Nitron - Sixty Symbols
Just a bit of fun for Christmas - we "physics review" one of this year's hot Christmas gifts.
No product endorsement (in fact it looks a bit "naff...
@bobbytookalook The right hand rule is not connected with the aerodynamic lift, it is simply a convention for the direction of the angular momentum vector. If the disk were spinning in the opposite direction the angular momentum vector would be pointing downwards, but the lift force would still b...
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ib9rt
subscribed to mikeselectricstuff
2 months ago
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ib9rt
commented
2 months ago
Standard Weight (feat. Vsauce) - Periodic Table of Videos
Some amazing artifacts - original standard weights for the pound and troy pound. The troy pound is made from pure platinum!
A correction.. The sil...
Thumbs up if you like pounds and ounces! SI units should stay with science where they belong. Potatoes don't get weighed in kilograms.
I thought Wellington won at Waterloo, not Napoleon?
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ib9rt
subscribed to periodicvideos
2 months ago
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ib9rt
commented
3 months ago
Crackers - Foodskey
Crackers aren't quite the same when you're a sensory scientist. Joanne Hort from the University of Nottingham explains why.
Foodskey films by Brad...
Enough with the big close-ups already! Zooming right in to people's faces is highly disconcerting!
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New Agilent 3000X Oscilloscope Firmware - EEVblog #209
Agilent have today released new 2.0 firmware for the 3000X series oscilloscopes. Dave takes a quick look at the new Arbitrary capability on the fun...
Shouldn't it be "arbo" capability? ;-)
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Bandsaw table
http://woodgears.ca/bandmil...
Bandsaw build part 5: Building the table. This table tilts on hinges instead of the usual trunions.
@murlove7 Making curved cuts probably depends on the set of the teeth on the blade. Each alternate tooth must be bent outwards slightly in opposite directions to give clearance to the blade allowing it to turn in the slot, and to allow the teeth to cut a little to each side as well as straight ah...
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Guinness Science - Sixty Symbols
Strange bubbles and foam are part of the allure of Guinness - at least when you discuss it with an Irish physicist.
Sixty Symbols is in Dublin dis...
@CommanderQ Ideal gas law = equation of state for ideal gases...
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Guinness Science - Sixty Symbols
Strange bubbles and foam are part of the allure of Guinness - at least when you discuss it with an Irish physicist.
Sixty Symbols is in Dublin dis...
@2xsf That's because they "dumbed down" Guinness to make it less offensive to uneducated drinkers. Guinness originally didn't have the unnatural addition of nitrogen bubbles, it was carbonated like proper beers and also had quite a different flavour. Today's Guinness is but a pale imitation of th...
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ib9rt
commented
6 months ago
How To Convert A Battery Powered Device To Wall Power
I show you how to convert a battery powered device, in this case- an electric screwdriver, to wall power so you can save batteries
I have one of those screwdrivers. I converted it to wall power by simply using rechargeable batteries (Eneloops are good). No need to modify the screwdriver, and it preserves the cordless nature of the device.
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How to Make Glow Powder with Household Chemicals
Jeri shows how to make ZnS:CU glow powder at home with household chemicals. Reaction 1: Flowers of sulfur(sublimated sulfur) + Zn + Cu(penny from ...
It seems you are trying to make pure ZnS and avoid contamination. But I recall you have a TIG welder (argon gas) and a home furnace (clean high temperatures). Therefore you might try putting your zinc powder and sulfur mixture in a tube in the furnace under a flow of inert gas? This is closer to ...
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Google SketchUp New Users 2: Drawing Shapes
This video covers some of the best practices for drawing shapes in Google SketchUp.
@24242ME I did not even look at the closed captions, "access" is what I hear with my own ears. She also says "drong" instead of drawing and "zyoom" instead of zoom. Her accent and intonation is hilariously painful to listen to.
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ib9rt
commented
6 months ago
Not the Nine O'Clock News Songs of Praise
Not the Nine O'clock News Songs of Praise with Rowan Atkinson as a frustrated vicar on songs of praise
No to hell with it, we'll sing hymn no. 387, "Good Christian men rejoice, the Beeb are back in town!"
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Not the Nine O'Clock News Songs of Praise
Not the Nine O'clock News Songs of Praise with Rowan Atkinson as a frustrated vicar on songs of praise
But you trot along in your nasty little suits, and my God didn't the hat shop do well this week? You come swanning in here, sitting on pews that haven't seen your bum or any bum in a month of Sundays. You don't know whether to sit, kneel or stand, you're up and down like a whore's drawers. Christ...
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Not the Nine O'Clock News Songs of Praise
Not the Nine O'clock News Songs of Praise with Rowan Atkinson as a frustrated vicar on songs of praise
And the week before that--Harvest Sunday--there were three of us: myself, the organist Mr. Posner, and a tin of spaghetti. Where were you bastards then? Sitting on your fat agnostic arses in front of Holiday '82 I should think, watching the reverend Cliff Michelmore preaching on sun tan availabl...
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Not the Nine O'Clock News Songs of Praise
Not the Nine O'clock News Songs of Praise with Rowan Atkinson as a frustrated vicar on songs of praise
Good evening. Songs of Praise this Sunday comes from our lovely old parish church of St. Stephen in the heart of the West Country, and I welcome you all to our simple service. You join a full congregation of local people who have come to worship tonight. Indeed it makes quite a change to have so ...
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EEVblog #191 - Mouse Trap Triggering
What's the easiest way to electronically trigger a mouse trap? Dave has an idea...
Just don't ask why, OK, Dave doesn't know either...
@jnrolf If the thermal resistance is 140 K/W then it is also 140 degC/W. Kelvin degrees and Celsius degrees are the same size (in other words, when converting one to the other the multiplication factor is 1).
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EEVblog #191 - Mouse Trap Triggering
What's the easiest way to electronically trigger a mouse trap? Dave has an idea...
Just don't ask why, OK, Dave doesn't know either...
@jnrolf No, Dave was right. 35 Kelvin degrees = 35 Celsius degrees. Remember we are considering temperature differences, not absolute temperature measurements. Degrees in this case means "degrees of difference".
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Spartacus' Lawless Talks Sex Scenes
Spartacus: Gods of the Arena's Lucy Lawless shares her feelings about doing the show's numerous sex scenes and what the process was for replacing A...
@Warunho Uh, no...I'm gonna guess New Zealand, just on a kind of hunch...
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ib9rt
commented
6 months ago
Natural Red 24 - Periodic Table of Videos
Brazilin, or Natural Red 24, is a chemical found in Brazilwood trees. We looked at it during our recent road trip to Brazil.
More chemistry at htt...
@XsDarkii Lastly, yes, engineering is hard. But without effort there is no reward... :-)
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Natural Red 24 - Periodic Table of Videos
Brazilin, or Natural Red 24, is a chemical found in Brazilwood trees. We looked at it during our recent road trip to Brazil.
More chemistry at htt...
@XsDarkii I am a chemical engineer and so I am somewhat biased in the answer I would give :-) But chemical engineering is unique in combining many areas of science from chemistry, physics, biology (brewing beer!) and of course mathematics. If you are unsure where to specialize, chemical engineeri...
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Rancilio cappuccino machine and Air Liquefier tank
A cappuccino machine thrown out by a movie theater looks like it will provide a near perfect tank for the cold side of the air liquefier. Also, cle...
240 V x 30 A = 7.2 kW, yet you said "six thousand watts" heater. Where did the extra 1.2 kW go?
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Dynamco DM2022S Digital meter review and teardown
Not-entirely-serious review of 1967 vintage digital voltmeter.
With apologies to Dave "EEVBLOG" Jones....
@Kankki1 The strange "up = on" convention is one of the many odd things you have to get used to when you first arrive in America. Down = on is normal everywhere else.
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EEVblog #182 - Rode Videomic Shotgun Microphone Hack
Dave does a quick hack on his Rode Videomic so he can actually see the battery LED when he's in front of the camera.
@Bushougoma No, I don't think you have got it. If two LEDs are in series they both get exactly the same current, so (if they are the same type of LED) they will have the same brightness. If they are different types of LED the brightness will depend on the properties of each LED. It is normal prac...
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About ib9rt's channel
Root 2 - Numberphile
The square root of two is a fascinating number with a long and sordid history. It also forms the basis of most office paper, such as A4, A3, etc.
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7,117 views
ib9rt said:
@SuperDevoted There is no reason why the ratio between two lengths cannot be root 2. Lengths are analog quantities with infinite precision, so you can easily make something with a length that is as close to root 2 as you wish. Of course in plane geometry you can have a line with a length of exact...
Root 2 - Numberphile
The square root of two is a fascinating number with a long and sordid history. It also forms the basis of most office paper, such as A4, A3, etc.
...
7,117 views
ib9rt said:
@BlindSoothsayer Yes. Notice he said the A-series paper sizes are used in most of the world? What he meant was *all* of the world except the USA ;-)
17 and Sudoku Clues - Numberphile
17 is the minimum number of clues required to give a unique sudoku solution - but how did mathematicians prove this?
Dr James Grime discusses a re...
7,843 views
ib9rt said:
@TheT1G0 If there existed a uniquely solvable puzzle with 15 clues, then you could fill in one of the blank squares with the only possible number that goes there and you would have a unique puzzle with 16 clues. But since it has been proven that no such 16 clue puzzle exists there is a contradict...
Jelly Babies - Periodic Table of Videos
We enjoy mixed success with a series of reactions involving jelly babies in potassium chlorate.
More chemistry at http://www.periodicvideos.com/
F...
12,884 views
ib9rt said:
In your equations you didn't show the first step (melting/fusing), which presumably is KClO3(s) -> KCl03(l) ? Seems odd to describe fusing with only (s) and (g) and no (l) state... ;-)
Jelly Babies - Periodic Table of Videos
We enjoy mixed success with a series of reactions involving jelly babies in potassium chlorate.
More chemistry at http://www.periodicvideos.com/
F...
12,884 views
ib9rt said:
@Mrjesse451 borosilicate glass (= Pyrex)
Outdoor LED Screen teardown (+how to drive LEDs with video)
A look inside a large outdoor LED screen, including detailed technical analysis of drive techniques for LED video displays.
1,894 views
ib9rt said:
You mentioned 18 bits of intensity resolution, but what is the smallest change in intensity the human eye can discern? Is there any point going finer than that?
Sushi Cat in Japanese TV
Sushi Cat in Japanese TV!
1,209 views
ib9rt said:
@Rabbits01 Who knows? They are speaking in Estonian...
+ 4 more videosshow less