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 May 19 answered What is the effect of humidity in temperature? May 19 comment can be exist the negative mass? And negative masses would attract each other, but repel positive masses, right? That's why they are somewhere far :) May 19 comment Problem with a rotating frame of reference on the South pole @Althalos, there is no centrifugal acceleration on the axis. In which direction could it be there? Your formula is correct, but the $R$ is distance from axis of rotation which is $0$ in your case. May 18 awarded Custodian May 18 reviewed Approve Problem with a rotating frame of reference on the South pole 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