To celebrate #BlackHoleWeek here is a collection of images, videos, interactives, activities, and background resources about black holes from NASA's Universe of Learning.
Liebe #PhysikEdu, #iteachphysics,
zum sich langsam nähernden Schuljahresende möchte ich an der Berufsfachschule das Wahlthema Wetterkunde (Wasser-, Luft- und Energiekreisläufe) durchnehmen. Dabei will ich schwerpunktsmäßig Klima und Treibhauseffekt usw. thematisieren. Wer teilt mit mir seine gute Ideen?
#PhysicsFactlet
A quantum simple pendulum.
The pendulum position is spread out, with opacity here being proportional to the probability that the pendulum is at that position at a given time. The average position of the quantum dynamics is the same as the classical pendulum dynamics (Ehrenfest theorem).
Technicalities: I used the Crank-Nicholson method to evolve the system in time. This is a 1D problem, and the only variable I considered was the angle, with the initial state being a Gaussian.
Spent a loooot of time during my break this week adding many new features to my #Desmos about the Doppler effect. I'm not done tweaking it but it's getting close. Please take a look and give me feedback. #ITeachPhysics
John Dutton got a nice picture of me presenting at the first inaugural Ohio CS summit! Here I am giving my usual sermon about how the black hole image in 2019 is a great example of how CS and modern science go hand in hand. @edutooters#iteachphysics#iteachmath
Looking to get the metre redefined so the average acceleration due to gravity on Earth is 10 ms^-2 so it's easier for my Year 12 physics students... they find the physics hard enough! 😀
This is interesting, it's almost as if my camera has x-ray capabilities. I took this as the turkey vulture passed on the other side of the oak tree in my backyard. You can see the out of focus outlines of the branches in the foreground. Of course, the branches weren.t that large in relation to the vulture.
@Swede1952#ITeachPhysics and there's some neat optics going on here! You may already know this, but each pixel in the camera's detector receives light from all parts of the lens. So as long as most of the lens has unobstructed line of sight to a given part of the bird, a nice image can still form.
It's more like you're seeing "around" the branches than through them because the lens has an area to it, it's not just a single point.
I’m listening to a pop physics book and they’re on the subject of relativistic effects. They are making the (common) statement that mass increases as velocity increases.
“...a body moving at 87% of the speed of light relative to some observer, will be measured by that observer to have double the mass it has when it's not moving.”
I have a problem with this. How does an observer measure the mass of a moving object? They are not in the same reference frame. If the observer is not measuring mass, but a consequence of mass, e.g. momentum, shouldn’t the author be saying this, instead?
#PhysicsFactlet
A microscope makes an image bigger than the object, i.e. it magnifies it. A telescope makes an image smaller than the object, i.e. it demagnifies it.
Which is good because you want your image of a star to be smaller than a star 🙃 #Optics#ITeachPhysics
#PhysicsFactlet
In the limit of small oscillations, a simple pendulum is isochronous, meaning that its period doesn't depend on how wide the oscillations are.
Once the oscillations get too big, the period starts growing, until they stop looking sinusoidal altogether. #ITeachPhysics#Physics
A really cool video showing the details of electricity flowing through wires that are connected vs disconnected. It's measured and graphed and is real interesting. https://youtu.be/2AXv49dDQJw?si=hmQUVOJNcCwQ--ZA
Schönes Freihand-Experiment zur Demonstration der Haftreibung. Wir haben das schon öfter im Unterricht gemacht. Es ist für die SuS sehr erstaunlich, dass sie die Blöcke bei entsprechender Anzahl auch mit Gewalt nicht mehr auseinander ziehen können…
On Dec 12, a tiny strip of the Earth will get to see Betelgeuse occulted by asteroid 319 Leona! What a cool (and scientifically fertile) event to witness. Not that I'll get to witness it myself, but still... #astronomy#ITeachPhysics
There is no age limit to study at Uni, or to do a PhD. Actually, very often the "mature students" do much better than the young ones.
The problem is not age per se, the problem is that to study you need time and (depending on the country you are in) money. And especially time is hard to come by when you are older.
But don't let age be what stops you from studying, if you want to study.
Die Werbetafel an der Bushaltestelle besteht aus einem um 90 Grad gedrehten großen Display. Mit Hilfe einer polarisierten Sonnenbrille hat man dann den passenden Real-Life-Adblocker am Start…
#PhysicsFactlet:
Signals (e.g. light) move at a finite speed, so there is a time lag between when they are emitted and when they are detected. If the source is moving, the detector will "see" the signal that was emitted at a previous time, not the signal that is being emitted right now, and this time lag can change with time in a complicated way.
(Notice that, as the source is always moving slower than the signal, the detector sees the signals in the same order they were emitted.) #Physics#ITeachPhysics#Electrodynamics#Optics#Relativity
Follow-up: if the source can move faster than the signal can propagate (which can easily happen with sound), the the emitter and the detector will not agree on the order of the signals, and thus on what happened first and what happened later. #Physics#Relativity#ITeachPhysics
Lava lamp demo for my Thermal Physics lecture this morning. In early to get it warmed up: 30 mins in and it's still solid. Will it be ready for my 9 am lecture?