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visits member for 1 year, 11 months
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Jun
30
comment How can Lorentz contraction be “directly” measured?
@Ruslan Note that "Rotation" shouldn't be taken on face value. Take for example this: en.wikipedia.org/wiki/… In diagram 2 a dimple actually forms in the sphere! (Hint: you're actually looking at the projection on the spatial axes of the intersection of a tilted cylinder with a cone).
Jun
4
answered Is proper time a vector?
Jun
3
revised What does QM say about the past rather than the future?
Change LaTeX
Jun
2
suggested suggested edit on What does QM say about the past rather than the future?
Jun
1
answered How is temperature related to color?
May
26
revised What does $\frac{1}{\sqrt{1 - \frac{v^2}{c^2}}}$ mean with respect to special relativity?
added 17 characters in body
May
26
answered What does $\frac{1}{\sqrt{1 - \frac{v^2}{c^2}}}$ mean with respect to special relativity?
May
25
revised Help me understand constant speed on a slope
Improved LaTeX
May
25
suggested suggested edit on Help me understand constant speed on a slope
May
18
comment Everything is a Photon
@JoshuaMeyers en.wikipedia.org/wiki/Matter_wave gives that $p=\hbar k$ and $E=\hbar \omega$ still hold, but instead of $E=p^2/(2m)$, we have $E=p c^2/v$. So $\hbar\omega=\hbar k c^2/v$. $E^2-(pc)^2=(mc^2)^2$ then simplifies to $(\hbar k)^2=(\gamma m c^2)^2=p^2$. So we just get $(\hbar k)^2=p^2$ again.
May
18
comment Jackson, Classical Electrodynamics - page 97: how to deal with the indexes of a series to obtain Legendre polynomials
Can you edit out the note that equation 1 is not written down correctly now that it's been fixed? Thanks.
May
18
answered Everything is a Photon
May
18
revised How are matrices used to represent quantities, and what is the meaning of a matrix?
added 1 character in body
May
18
answered How are matrices used to represent quantities, and what is the meaning of a matrix?
May
11
comment Are intergalactic voids inertial frames?
@rijulgupta the principle of equivalence says that being in a frame where objects experience a gravitational force is equivalent to being in a nonintertial frame.
May
7
answered What is the cause of Special Relativity
May
3
comment How does light bend around my finger tip?
@Virtlink, the ray model is useful and intuitive, just like incorrect ideas can be useful and intuitive, but light is not a particle travelling through space, it is a wave travelling through space (under the classical E&M picture).
May
2
answered Do I need to take weight of the rocket into account when calculating escape velocity?
Apr
28
suggested suggested edit on Trouble with proof about operators in QM
Apr
28
comment How can I compute the angular velocity of a triangle formed by three particles knowing their instantaneous positions and velocities?
I don't understand. Why are we interested in the angular velocity of $\hat{n}$? If it is spinning perpendicular to its plane, won't $\hat{n}$ be zero, while there is nonzero angular velocity?