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May
7
answered Magnetic Permeability & Reluctance on old exam question
May
7
comment Magnetic Permeability & Reluctance on old exam question
That figure for magnetic permeability of free space doesn't seem to be right.
Mar
15
comment Einstein's Gedanken Experiment that lead to the Special Theory of Relativity
@JohnRennie was already adding in the other text as you posted :)
Mar
15
revised Einstein's Gedanken Experiment that lead to the Special Theory of Relativity
added 1300 characters in body
Mar
15
answered Einstein's Gedanken Experiment that lead to the Special Theory of Relativity
Mar
7
revised Why does a microwave oven affect other electronic devices
added 118 characters in body
Mar
7
answered Why does a microwave oven affect other electronic devices
Feb
28
comment What happens when a supersonic airplane flies through a cloud?
@AaronDigulla It's a cloud layer it is going through...I wouldn't say it's deformed as such; really the effect is sort of like ripples on a pond when you throw a pebble in.
Feb
28
revised What happens when a supersonic airplane flies through a cloud?
added 114 characters in body
Feb
28
comment What happens when a supersonic airplane flies through a cloud?
An Atlas V rocket certainly goes supersonic. If you go to the linked page, you can see that the shocks map to the discontinuities in the rocket surface quite nicely. Also, the shocks are not in front - it's hard to tell but the shocks form a cone behind the rocket. Again, check the linked page for a diagram.
Feb
28
answered What happens when a supersonic airplane flies through a cloud?
Feb
28
comment What happens when a supersonic airplane flies through a cloud?
It's a "Prandtl-Glauert cloud" from the P-G 'singularity'.
Feb
28
comment In-flight damage to a supersonic jet
Mike is correct - if the engines can't go supersonic, you could always use gravity! But there is an ideal shape for supersonic flight (en.wikipedia.org/wiki/Sears-Haack_body) and any deviation from that shape will tend to cause shock waves. The shock waves cause rapid compression and decompression near the surfaces. This can then lead to resonance conditions like flutter or buffeting, where resonance causes vibrations to grow and grown until things fall apart.
Feb
28
answered In-flight damage to a supersonic jet
Feb
26
revised Frequency of nomad planets passing within 30 AU of the sun
added 1 characters in body
Feb
26
comment Frequency of nomad planets passing within 30 AU of the sun
Further: since one can assume that there are many more Pluto-sized bodies than Jupiter-sized, then let's say then that the distribution is roughly logarithmic: we get on average a Pluto-sized body every 50 million years, a Moon-sized body every 150 million, a Mars-sized body every 350 million, an Earth-sized body every billion years. Doesn't sound unreasonable at all.
Feb
26
answered Frequency of nomad planets passing within 30 AU of the sun
Feb
23
comment Experimental proof of gravitational redshift of light
Great minds, etc.
Feb
23
answered Experimental proof of gravitational redshift of light
Feb
21
comment Keeping air in a well
If the planet is Earth-like in its geology, digging a hole deeper than 50km is going to be problematic since you'd be up against the mantle.