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seen Oct 19 at 13:11

Jul
18
awarded  Teacher
Jan
8
answered Mass-spring system on an incline
Jan
2
comment Trouble with classical mechanics self-learning (How to avoid going down the Physics rabbit hole?)
If you like a good book, I recommend "The variational principles of mechanics" by Lanczos amazon.com/Variational-Principles-Mechanics-Dover-Physics/dp/…
Dec
9
awarded  Talkative
Dec
2
comment The nature of theoretical models
If you simplify physics enough then you can solve its resulting mathematical model exactly.
Dec
2
comment best fundamental physics book
I'd go to the source and read Newton's Principia en.wikipedia.org/wiki/… Better to read Newton's laws written by Newton himself rather than by others.
Oct
11
comment Projectile Motion
why did you write the kinematic equation with negative sign there?
Oct
10
comment Ball on a slope
can you share with us the result of this experiment? i.e. the 4 time values?
Sep
21
awarded  Commentator
Feb
11
comment Why do astronomers never put a scale on their photographs?
good question. But I think the answer is simple. To put scale on the image requires using the correct plot command to add legend to the plot. This is not easy to do in most plotting software. Given that the scientists who take these pictures are very busy (and most are not good programmers, but that is ok, they have more important things to do, which is find stars and new planets and other more important things like this than spend the time to find the legend command in some GUI library and figure how to use it), then the picture ends up with no scale added.
Aug
18
awarded  Scholar
Aug
18
accepted If a pendulum is on a rotating table, will a torque be generated?
Aug
17
revised If a pendulum is on a rotating table, will a torque be generated?
cleaned up, removed old comments not relevent any more, makes the question more clear
Aug
17
revised If a pendulum is on a rotating table, will a torque be generated?
typo
Aug
17
comment If a pendulum is on a rotating table, will a torque be generated?
There is a torque actually. It is due to Coriolis force. It is not an external applied torque. Not sure what it is called. But it is there. Yes, the angular momentum does remain constance. Verified from simulation.
Aug
17
revised If a pendulum is on a rotating table, will a torque be generated?
update
Aug
17
comment Why does a cuboid spin stably around two axes but not the third?
The teacher once told us a story that in the early days of satellites, engineers deployed one by having it spin around the wrong axis and they ended up losing the satellite as a result. I do not remember when and where this happened. 60's ? May be googling this can bring it up. Will try to find out. Seem to remember he said it was a Russian satellite but not sure now.
Aug
16
comment If a pendulum is on a rotating table, will a torque be generated?
Any torque du to the coriolis force is balanced by the reaction of the slot. Yes. That is how the simulation is currently implemented. No torque. My main question was, if there will be a torque generated on the disk by the bob or not. It looks like most here agree that there is no net torque present. thanks
Aug
16
revised If a pendulum is on a rotating table, will a torque be generated?
update
Aug
16
revised If a pendulum is on a rotating table, will a torque be generated?
update