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visits member for 4 years, 1 month
seen Apr 30 at 13:31

Apr
27
comment Wave speed from moving source?
This is a version of the Doppler effect. It is about frequency rather than wave speed
Apr
16
comment Can we theoretically balance a perfectly symmetrical pencil on its one-atom tip?
There is a mathematical continuity argument which suggests that there may be a starting position at which the pencil will remain balanced for any pre-specified amount of time (in effect, consider the starting positions which lead to the pencil falling over in particular directions). This probably does not survive a quantised viewpoint.
Mar
23
awarded  Yearling
Feb
24
comment Will the upcoming solar eclipse stress the European electrical grid?
The rate of change is more dramatic in time than the effect of clouds (you can see France's solar generation in blue lines in the second column of gridwatch.templar.co.uk/france ) but since the effect is predictable, there will be dispatchable sources used to fill the gap (probably a combination of hydro, pumped storage, gas and coal). In terms of balancing supply and demand it will probably be no less dramatic than each day's sunset leading to a boost in demand.
Sep
30
awarded  Explainer
May
12
comment How long does it take an iceberg to melt in the ocean?
In 2008 a rather smaller (27 km^2 but still 1 to 2 Petagrams) ice island calved off the same glacier and was tracked for a year, including a frozen winter, as it travelled almost 20 degrees south to Frobisher Bay.
Mar
23
awarded  Yearling
Nov
29
revised Archimedes' principle for two liquid layers
see comment on denominator
Nov
29
comment Archimedes' principle for two liquid layers
You are probably correct about the denominator - I will edit
Nov
28
answered Archimedes' principle for two liquid layers
Nov
28
comment Archimedes' principle for two liquid layers
Messy may be the correct word for overflows, but it depends on the liquids you have to clean up.
Nov
28
answered How many years would it take the Pioneer space probe to travel to Proxima Centauri with its current speed?
Nov
26
awarded  Enlightened
Nov
26
awarded  Nice Answer
Nov
23
answered Strange behaviour of water drops on a heated pan
Oct
4
comment What happens when a bacteria tumble? Is it an active or a passive process?
That is a biological question
Sep
10
comment What is the geometry behind special relativity?
SR geometry is an affine geometry, so is flat like Euclidean geometry, but has a different symmetry group.
Sep
6
comment Is there a closed form solution to the Esdale river problem?
+1 both for "the solution always exist" and for the solution by inspection "no flow crosses this line"
Aug
26
answered Force and Area are proportional to each other, but
Jul
29
awarded  Cleanup