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Hypothetical situation in which, for simplification, only some physical aspects are considered in order to further understand or reveal contradictions between the laws governing them.

4 votes
Accepted

Linear version of Faraday Paradox: different results in different inertial frames

There is no net force on the charged particles and no charge separation. If there were then you would have a way of invalidating Special Relativity because you would have a way of defining an absolute …
ProfRob's user avatar
  • 137k
18 votes
Accepted

Ground → ship Wi-Fi bandwidth in my fast moving spaceship

If you are in a perfectly circular orbit, then your received signals are affected by the relativistic transverse Doppler effect. The signals you would receive would be blueshifted by the Lorentz fact …
ProfRob's user avatar
  • 137k
11 votes

Taking selfies while falling, would you be able to notice a horizon before hitting a singula...

The answer must be closely related to my answer in Thought experiment - would you notice if you fell into a black hole? You can certainly use a similar Eddington-Finkelstein coordinate diagram to cons …
Community's user avatar
  • 1
2 votes

Can you find the length of a pencil without a ruler or clock?

Strip out the graphite from the pencil and make an estimate of the diameter of the "lead" compared to the length of the pencil. e.g. If the pencil is height $n$ metres, and the pencil "lead" has a dia …
ProfRob's user avatar
  • 137k
3 votes

Thought experiment about wavelength of light through a medium

The size or path-length that the wave has nothing to do with it. There are two explanations on offer for why the frequency of the radiation remains unchanged as it crosses the boundary between differ …
ProfRob's user avatar
  • 137k