217 reputation
18
bio website
location
age
visits member for 2 years, 6 months
seen yesterday

Sep
30
comment How can we minimize the coefficient of static/kinetic friction?
Are you trying to reinvent the wheel?
Sep
30
comment Why can we cycle faster than we can run?
A typical biker rests on downhills, but I don't think a Tour de France biker ever does.
Sep
18
comment Why is the Earth's moon so big?
Is there something about this in the essay "The tragedy of the Moon" by Isaac Asimov? As far as I can remember, it's only about the consequences of a large moon, not about the causes.
Sep
18
comment Draw the charge configuration according to the electric field
@CuriousOne: do you mean to say that it's not realizable as an field with only static charges, because the field is not conservative, or equivalently, its integral on some closed paths isn't zero?
Jun
26
comment Understanding the “$\pi$” of a rotating disk
This entry of the usenet Physics FAQ is related to this question: math.ucr.edu/home/baez/physics/Relativity/SR/rigid_disk.html The Rigid Rotating Disk in Relativity
Mar
31
awarded  Yearling
Dec
7
comment How much lift does the average latex helium filled party balloon produce?
Don't you have to subtract the mass of the balloon skin itself?
Oct
16
comment can resistance be found without knowing length?
See the related question physics.stackexchange.com/q/80933 Resistances in a circular loop.
Sep
28
awarded  Informed
Jul
22
answered Numerical relativity coordinate system displayed
Jul
5
comment Cyclist's electrical tingling under power lines
@LuboŇ°Motl: if you want to decide whether to repeat the unpleasant experiment, consider xkcd.com/242 first.
Jun
13
comment How to cut a stone on on a White Dwarf
@Michael Brown: just ask on scifi.stackexchange.com
May
24
comment Difference between $\Delta$, $d$ and $\delta$
Don't forget $\partial$ either! :-)
May
16
comment Superluminal particles with causality
See also the usenet physics faq, question "Do tachyons exist?": math.ucr.edu/home/baez/physics/ParticleAndNuclear/tachyons.html
May
14
comment Why metric system uses kilogram as a basic SI unit?
@Gugg: you can distinguish because many derived units such as newton, joule, pascal, volt etc are products of kilogram and other basic units. Because of this, when you do calculations writing all numbers in SI measurements, you use kilogram so it matches values with other units, and to match expectations of other people. The gram only behaves like a basic unit when you write values with prefixed units and the unit starts with kilogram.
May
5
awarded  Citizen Patrol
Apr
30
awarded  Critic
Mar
12
comment Seeing a mirage through mirror?
Vampires don't have a reflection in mirrors, right?
Mar
12
awarded  Commentator
Mar
12
comment How much energy would it take to blow up the earth?
qntm.org/data gives the same figure.