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visits member for 1 year, 11 months
seen 13 hours ago

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.
Feb
27
comment Speed of an object in air versus in vacuum
Firework rockets have a solid propellant and use the oxygen from the air, so they don't work in vacuum.
Jan
19
accepted Can you tell just from its gravity whether the Moon is above or below you?
Jan
18
comment The direction of the Lorentz Force
Is the green area on the left hand side the north magnetic pole? I can't make out the letter on the figure.
Jan
11
awarded  Nice Question
Jan
11
awarded  Scholar