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May
18
comment Physics of every-day life: rotating bag of tea
I think it's just the torque that's stored in the thread...
May
18
comment Problem with a rotating frame of reference on the South pole
Rotating frame in which train is going straight (as says in the exercise). Yes, $\Omega$ is. Try $\tan(\theta)=F_c/F_a = a/g$. Also $\tan(\theta) = \sin(\theta) = \theta$ (in radians) should for work such a small angle.
May
18
answered Problem with a rotating frame of reference on the South pole
Apr
28
comment Why does the fundamental mode of a recorder disappear when you blow harder?
@Georg, a few years late answer, bet I wanted to add that the higher mode does not slowly overtake. It's a sudden shift of pitch.
Apr
28
comment What is the exact mechanism by which time dilates?
Great answer except "Lengths just look different in different frames. Similarly times look different in different frames." I think it is important to understand that length don't look or appear different in other frames. They are different in other frames.
Apr
28
comment Confused about the Photoelectric Effect?
Yes, w/h is correct.
Apr
27
answered Confused about the Photoelectric Effect?
Apr
13
answered Can we derive the Schrödinger equation from the Klein-Gordon equation?
Feb
8
awarded  Yearling
Jan
20
accepted Does quantum mechanics allow faster than light (FTL) travel?
Jan
19
comment Does quantum mechanics allow faster than light (FTL) travel?
Umm, superluminal signalling. I am not asking for true violation of SRT, just something similar to tunneling but without a barrier. There's no need to violate any theory as long as speed exceeds $c$ :D
Jan
17
accepted Why does smoke go inside the car if the back door is open?
Jan
16
revised Does quantum mechanics allow faster than light (FTL) travel?
again reformulated question
Jan
16
comment Does quantum mechanics allow faster than light (FTL) travel?
Sorry, I realized that by QM people understand certain theories, but my aim was to actually ask about actual (experimental?) quantum physics.
Jan
16
revised Does quantum mechanics allow faster than light (FTL) travel?
reformulated question
Jan
16
comment Does quantum mechanics allow faster than light (FTL) travel?
Please see the reformulated questions, I want to know about actual physical (experimental) QM, not what classical QM theories state or not.
Jan
16
revised Does quantum mechanics allow faster than light (FTL) travel?
reformulated question
Jan
16
answered Why does smoke go inside the car if the back door is open?
Jan
16
comment Why does smoke go inside the car if the back door is open?
In this case the rear part was separate and had no windows, there was only one door.
Jan
16
comment Does quantum mechanics allow faster than light (FTL) travel?
So the front is actually not allowed to move FTL in relativistic QM?