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visits member for 2 years, 2 months
seen Oct 10 at 22:38

Jan
1
asked How close together must air molecules be to bounce off one another?
Nov
14
awarded  Popular Question
Oct
5
comment What IS reflection?
Why is it that in specular reflection, all wavelengths are reflected, whereas in diffuse reflection, absorption of some wavelengths occurs before emission, so that only some wavelengths are reflective? I assume it's because the final sentence of your last comment does not occur readily in rough surfaces (why?).
Oct
3
comment Whose reference frame to use for $d \theta$ near a black hole?
@BenCrowell by the way, am I actually able to use the SM if the satellites are orbiting (I ask as it's not accurate if the black hole itself is rotating)?
Sep
30
comment Whose reference frame to use for $d \theta$ near a black hole?
Do you have a link detailing this thoroughly (ideally without tensors or similar wizardry)? I've got most of my information from Wheeler's introductory 'Black Holes', and whilst it's brilliant in getting intuition, it's often not very rigorous.
Sep
30
accepted Whose reference frame to use for $d \theta$ near a black hole?
Sep
30
comment Whose reference frame to use for $d \theta$ near a black hole?
I meant it to be transverse. Thank you, this was one of the problems I was having earlier. I'm trying to deduce the difference in the time signals between being sent by GPS satellites and Earthlings receiving them.
Sep
30
comment Whose reference frame to use for $d \theta$ near a black hole?
I was careless with pasting the second equation. I realise that $c=1$ is useful, but haven't been doing GR long enough to really feel at ease with it.
Sep
30
revised Whose reference frame to use for $d \theta$ near a black hole?
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Sep
29
asked Whose reference frame to use for $d \theta$ near a black hole?
Sep
28
comment Pendulum Hits a Mass and Spring
It's not entirely clear what the situation is. Could you explain in more detail where the mass, spring and pendulum begin, or provide a picture?
Sep
3
awarded  Popular Question
Aug
25
awarded  Yearling
Aug
16
comment What is the maximal height for a water rocket's flight?
Thanks, but the part of the question I find especially is determining $\mathbf{u}(t)$ and $\mathbf{v}(t)$.
Aug
16
comment What is the maximal height for a water rocket's flight?
@Johannes Here I meant it to mean 'initial'. I'll edit for clarity.
Aug
16
revised What is the maximal height for a water rocket's flight?
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Aug
16
comment What is the maximal height for a water rocket's flight?
@Johannes Yes, as the water cannot move further up than the top of the cylinder.
Aug
16
revised What is the maximal height for a water rocket's flight?
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Aug
16
revised What is the maximal height for a water rocket's flight?
deleted 1 characters in body
Aug
16
revised What is the maximal height for a water rocket's flight?
deleted 1 characters in body