Imagine a circular wheel rolling, without skidding, on a flat, horizontal surface. The #locus of any given point on its #circumference is called a #cycloid. It is a #periodic#curve with #period over the #circle's circumference and has #cusps whenever the point is in contact with the surface (the two sides of the curve are tangentially vertical at that point).
Interestingly, it is also the curve that solves the #Brachistochrone problem, which means that starting at a cusp on the inverted curve (maximum height), a frictionless ball will roll under uniform gravity in minimum time from the start to any other point on the curve, even beating the straight line path.
#PhotoOfTheDay: Niels Bohr and Max Planck photographed in front of a chalkboard, around 1930.
The two are considered pioneers of #Quantum#Mechanics and two of the founders of quantum theory, each receiving a #NobelPrize in Physics for their work on quantum theory.
Japanese mathematician/creator Yosuke Ikeda designed this innovative signboard. It’s a clever use of mechanical engineering to merge form and function.
I pulled these early, with about 70,000 miles on them as the car runs a little rough during idle. Note the discoloration on plug 1, rt in both images. Electrodes look good on all of them. Note darkness on seat not seen on others. Also note discoloration on ceramic insulator on 1 and 2, not seen on other plugs. Comments welcome. #SparkPlugs#mechanics#ShadeTreeMechanic#cars
Proof that #quantum#mechanics is actually classical #physics lurks in Clauser: you simply treat the angle zero as an origin, rather than do what Clauser does illegitimately (though Nobel winningly, which will result in a shock one day) and treat angles as absolute with respect to the Cosmos. Then a factor becomes cos(0)=1 and finally you have the correct correlation coefficient. And computer programs can easily be written to serve as experimental examples.
Print it yourself at https://oskarvandeventer.nl/Print-It-Yourself/. Buy at https://i.materialise.com/en/shop/item/wobbly-planets or at https://www.shapeways...
Troy Grady put together a series of videos called "Cracking The Code" which was about trying to understand how various guitar players achieve high speed playing. It's an absolutely fascinating analysis that he has developed over the years. He just posted this video about wrist motion and I find it absolutely fascinating. If you like this, trust me that there's a big rabbit hole waiting for you. #guitar#mechanics#ergonomics#analysishttps://youtu.be/NWuGkXhj0T8?si=r-4gr1-V4D1jNW_q
For the #mechanically#disinclined -- #seatbelts lock, mechanically, based on the amount of force you put on them. I know of (multiple!) people who have issues with this, because they are violently grabbing the seatbelt to put it on quickly (thus locking the seatbelt). Pulling it harder just locks it more. The trick is to SLOWLY and SMOOTHLY pull the seatbelt out and then secure yourself. No, there's nothing wrong with the seatbelt... it's their seatbelt technique.
This vintage motorcycle gang is heavily recruiting goldwing members in your area! A couple chromed out vintage honda goldwings with their little brother the silverwing....
More OskarPuzzle at https://www.youtube.com/OskarPuzzle?sub_confirmation=1. Buy at https://www.shapeways.com/product/5MRJRBN9J/irrational-gears. Irrational G...
Because a quick internet search only brought up pages that either want to sell me something or instruct me on car engines:
Which (biodegradable) oil do I need to use for an electric motor? The oil in my 100W fan was garbage and is now semi-solid goo. #electronics#mechanics#repair
(Same fan with the dead capacitor, these things (picture, alt text) are definitely made to fail and are sold by multiple companies. DO NOT BUY!)
Wobbly Planets - How come that these gears fit so perfectly? (www.youtube.com)
Print it yourself at https://oskarvandeventer.nl/Print-It-Yourself/. Buy at https://i.materialise.com/en/shop/item/wobbly-planets or at https://www.shapeways...
Gorgeous vintage motorcycles (pixelfed.social)
This vintage motorcycle gang is heavily recruiting goldwing members in your area! A couple chromed out vintage honda goldwings with their little brother the silverwing....
Irrational Gears (www.youtube.com)
More OskarPuzzle at https://www.youtube.com/OskarPuzzle?sub_confirmation=1. Buy at https://www.shapeways.com/product/5MRJRBN9J/irrational-gears. Irrational G...