All posts; Tags Include "Relativity"
- February 3, 2010
- 10:55 AM
- 302 views
Accelerated Twins: The Answer
by Chad Orzel in Uncertain Principles
Yesterday's post on a variation of the "Twin Paradox" with both twins accelerating was very successful-- 337 people voted in the first poll question, as of a little before 9am, and the comments to the original post are full of lively discussion. That's awesome.
I wish I could take credit for it, but the problem posed is not original to me. It comes from a 1989 paper in the American Journal of Physics, which also includes the following illustration setting up the situation:
The article contai........ Read more »
Boughn, S. (1989) The case of the identically accelerated twins. American Journal of Physics, 57(9), 791. DOI: 10.1119/1.15894
Desloge, E. (1991) Comment on ‘‘The case of the identically accelerated twins,’’ by S. P. Boughn [Am. J. Phys. 57, 791–793 (1989)]. American Journal of Physics, 59(3), 280. DOI: 10.1119/1.16580
- January 4, 2010
- 03:07 AM
- 261 views
Space is very fine-grained
by Charles Daney in Science and Reason
It would take you a lot longer to hike a significant distance over very hilly terrain than it would over a completely flat plain. For much the same reason, it would take light longer to cover the same distance depending whether the space through which it moves does or doesn't have large "hills".But what does it mean for space to contain "hills"? And how large do "hills" need to be to make a difference?Consider the second question first. There's no natural place on Earth that is perfectly flat, o........ Read more »
Abdo, A., Ackermann, M., Ajello, M., Asano, K., Atwood, W., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Baring, M.... (2009) A limit on the variation of the speed of light arising from quantum gravity effects. Nature, 462(7271), 331-334. DOI: 10.1038/nature08574
- September 29, 2009
- 01:27 PM
- 627 views
across the universe in a lifetime. with a catch.
by Greg Fish in weird things
New Horizons is the fastest spacecraft launched so far by humans. After a gravity assist from Jupiter, it’s on a course to rocket past Pluto at 47,000 miles per hour. At that speed it would circle our world in a little under 32 minutes, make it to the moon in just five hours, reach Mars [...]... Read more »
Heyl, J. (2005) The long-term future of space travel. Physical Review D, 72(10). DOI: 10.1103/PhysRevD.72.107302
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