MinutePhysics: de ce clonarea perfectă nu este posibilă

Why you can’t clone Schrödinger’s cat: this video presents the full proof of the “No Cloning” Theorem in Quantum Mechanics – without any fancy math! (stereotypical qubit has been replaced with Schrödinger’s cat).

The full proof relies on the linearity of quantum (aka unitary) transformations, and the tensor product of multiple systems, to show that perfect cloning is impossible (though teleportation is allowed).

MinutePhysics: entropia și timpul

O miniserie de cinci episoade:

MinutePhysics cât de lungă e o zi pe Soare

This video is about the definition of a day, and how it applies (or not) on the sun. Solar day, sidereal day, universal coordinated time (UTC) day, etc. Length of a day.

MinutePhysics: proveniența galaxiilor

Thanks to the Space Telescope Science Institute (STScI) and NASA’s James Webb Space Telescope for supporting this video! In particular, thanks to Dan Coe of STScI for taking the time to chat with me about what we do and don’t know about baby galaxies and how they’re born.

MinutePhysics – o rezolvare pentru paradoxul bunicului

What if you went back in time and killed your own grandfather? Would you still be born? Or would you have thus killed yourself? Thanks to Google #sciencegoals for sponsoring this video!

MinutePhysics – Big Alien Theory

Minute Physics provides an energetic and entertaining view of old and new problems in physics – all in a minute!

MinutePhysics: teleportarea cuantică

Minute Physics provides an energetic and entertaining view of old and new problems in physics – all in a minute!

MinutePhysics: cum știm compoziția atmosferei altor planete

How do we know what the air is like on planets we haven’t visited? This video explains how to see air from 150 light years away.

Thanks to NASA’s James Webb Space Telescope project at the Space Telescope Science Institute for supporting this video.

MinutePhysics: de ce decembrie are cele mai lungi zile

December has the longest solar days (noon-to-noon) because of the weird way a combination of the axial tilt of the earth and the eccentricity of its elliptical orbit conspire in December. Perihelion + Solstices = Long Days.

MinutePhysics: fizica coliziunilor de maşină

How is the chemical energy of gasoline transformed into kinetic energy of a moving car? And where does that kinetic energy go when the car crashes into something and stops moving?