cianfa72's latest activity

Better, I'd say the angular momentum is a bi-vector -- https://en.wikipedia.org/wiki/Angular_momentum

I was taking the more advanced viewpoint in which the momentum ##\boldsymbol p## is actually a co-vector (see for instance MTW chapter 2.5).

By contrast to a rotating frame of reference. It is not spinning. We may take it as an article of faith that any "frame" we speak of...

I mean the frame in which the system's CoM stays always at rest (zero total ##\vec P## w.r.t. it). Basically it shares the system's CoM...

To take it simple, one could reasonably model the walls of the ISS as the rim of a 2D disk in which the center of mass (CoM) is...

He means that it rotates 360 degrees relative to the gyroscope's axis, which is Fermi-Walker transported along the ISS's worldline.

You mean in one revolution about the Earth (90 minute orbit) the ISS rotates through 360 degree about itself.

BTW, the point I'd like to be sure is what I asked in the OP. Namely, in the context of Newtonian physics, at a given universal time...

I can just explain what one actually should understand regarding this stuff. Assume we have a system of particles ##A_1,\ldots, A_N##...

The gyroscope in the video is spinning about it's axis (even while it's housing is not spinning), but it is difficult to see. How this...

No, thanks for your time !

Suppose ##OXYZ## isn't inertial. Then your external ##\boldsymbol F_k## also includes the inertial force that appears acting on the...

A very basic question about the properties of angular momentum for a system of particles. In a reference frame (inertial or otherwise)...

Just to be clear: take a timelike congruence in spacetime. Fix an event/point on each of them and take three spacelike vectors (in the...

Yes, indeed (maybe it wasn't that evident in the video, though). As far as I understand, the ISS's center of mass (CoM) is...