cianfa72's latest activity
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cianfa72 replied to the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit?.You mean in one revolution about the Earth (90 minute orbit) the ISS rotates through 360 degree about itself. -
cianfa72 replied to the thread Undergrad Properties of angular momentum.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...
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I can just explain what one actually should understand regarding this stuff. Assume we have a system of particles ##A_1,\ldots, A_N##...
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cianfa72 reacted to Sagittarius A-Star's post in the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit? with
Like.
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... -
cianfa72 replied to the thread Undergrad Physical Interpretation of Frame Field.No, thanks for your time !
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cianfa72 replied to the thread Undergrad Properties of angular momentum.Suppose ##OXYZ## isn't inertial. Then your external ##\boldsymbol F_k## also includes the inertial force that appears acting on the...
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A very basic question about the properties of angular momentum for a system of particles. In a reference frame (inertial or otherwise)...
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cianfa72 replied to the thread Undergrad Physical Interpretation of Frame Field.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...
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cianfa72 replied to the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit?.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...
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cianfa72 replied to the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit?.Yes, definitely. What I can't see clearly from the video is: was the gyroscope spinning about its axis when the astronaut placed it on...
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cianfa72 replied to the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit?.In this video at 06:30 the astronaut places the gyroscope on the string attached to the walls of the ISS cabin. I'm not sure whether the...
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cianfa72 reacted to PeterDonis's post in the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit? with
Informative.
Geodesic paths are not curved. They are straight, by definition: geodesics define what "straight" means. Locally, a gyroscope can't... -
cianfa72 reacted to PeterDonis's post in the thread Undergrad About global inertial frames in GR with
Agree.
"Geodesic deviation" is the wrong term here, it does not apply to worldlines in a congruence. It applies to the spacetime geometry... -
cianfa72 reacted to PeterDonis's post in the thread Undergrad Physical Interpretation of Frame Field with Like.
If you can Lie drag a vector field, how to Lie drag the integral curves of that vector field should be obvious.
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cianfa72 replied to the thread Undergrad Physical Interpretation of Frame Field.Do you think the above actually makes sense ?