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asked Why does conservation of étendue matter when showing one cannot focus light to arbitrary temperatures?
Dec
5
asked Why should gluons move at a speed determined by $\mu_0$ and $\varepsilon_0$?
Nov
30
awarded  Popular Question
Nov
24
comment How does $p=fv$ hold when $v=0$ and an engine is working?
I'm implicitly assuming that force and displacement are colinear, just for simplicity of presentation.
Nov
21
comment How can I apply Planck's law to calculate the photon energy density of a warm room?
Intuitively, if you put an object into this little volume, how many photons per second would hit it?
Nov
21
comment How can I apply Planck's law to calculate the photon energy density of a warm room?
Could you clarify "take the volume as your system" please? I think you've glossed over the essential core of my question :-)
Nov
19
asked How can I apply Planck's law to calculate the photon energy density of a warm room?
Nov
4
comment How is it possible that quantum phenomenons (e.g. superposition) are possible when all quantum particles are being constantly observed?
Here's a nice short story which illustrates the philosophical problem nicely. Why our subjective experience of measurements is the way it is is a big mystery.
Nov
4
asked How can quantum wavefunctions be smooth/continuous when particles are created/destroyed/changed?
Sep
29
asked If changing inertial reference changes velocity/energy, shouldn't that produce conflicting observations of gravity?
Aug
4
awarded  Popular Question
Jul
31
awarded  Notable Question
Jul
29
revised Has New Horizons' visit to Pluto taught us anything deeper than mere… facts?
added 162 characters in body
Jul
29
asked Has New Horizons' visit to Pluto taught us anything deeper than mere… facts?
Jul
24
awarded  Good Question
Jun
16
comment How is angular momentum conserved in this proton+water scenario?
Take our origin to be the topmost hydrogen atom, so $r$ and $p$ are colinear, $L$ is zero.
Jun
15
comment How is angular momentum conserved in this proton+water scenario?
Angular speed is initially zero, nothing is rotating. How can angular momentum be zero?
Jun
15
awarded  Popular Question
Jun
15
asked How is angular momentum conserved in this proton+water scenario?
Jun
12
asked Why does planetary spin affect the stability of orbits?