GR9677 #37



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Comments 
mpdude8 20120420 14:22:44  Yeah, I took the logic approach to this one as well. To someone standing watching this happen, the velocity of the new particle must be somewhere between 0.6c and 0.9c, and you can eliminate E because, come on, adding velocities in relativity is never that easy.
jdbro 20141023 18:37:24 
nice

  nirmalpratheep 20101106 19:49:31  =,
where
=5/4
=
Therefore, =0.6*(4/5)=0.48c;
=+=0.48c+0.3c=0.78c0.76c(D)   Albert 20091022 16:18:41  Relativity is so glamorous! I love it.
Thank you, dear uncle Albert :)
  spacebabe47 20070923 07:43:14  Or, if you can't remember the formula, but you have seen any SR before you should know that the speed of the emitted electron will be greater than the atom (0.3 c) because they are traveling in the same direction, greater than the electron's speed in the rest frame of the atom (0.6c) because it is in a moving frame relative to the lab, but less simply adding the velocities (0.3c+0.6c=0.9c). This eliminates A,B, and E. A frame moving at 0.3c is fast enough to have a measurable impact on the velocity of the electron, so 0.76 seems more reasonable than 0.66c. Pick D.
sirius 20081106 22:51:34 
haha, sadly this is my typical approach to relativity. it's never the classical expectation, and its always faster than either of the particles alone. I nearly always choose the one thats slightly less than adding the two velocities. If only I had a better professor and a better text when I learned this stuff.

Kabuto Yakushi 20100907 15:18:48 
A good solution..Albert would be so disappointed! LOL

aprilrussell 20180530 03:43:14 
Relativity is so glamorous! I love it. \r\nhttps://run2.online/run3

 

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Or, if you can't remember the formula, but you have seen any SR before you should know that the speed of the emitted electron will be greater than the atom (0.3 c) because they are traveling in the same direction, greater than the electron's speed in the rest frame of the atom (0.6c) because it is in a moving frame relative to the lab, but less simply adding the velocities (0.3c+0.6c=0.9c). This eliminates A,B, and E. A frame moving at 0.3c is fast enough to have a measurable impact on the velocity of the electron, so 0.76 seems more reasonable than 0.66c. Pick D.

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