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Home Q & A Board Science-Related Homework Help Physics
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Chery Chery
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7 years ago
Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from him in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Gamma moving?
A) 0.70c
B) 1.4c
C) 0.82c
D) 0.94c
E) 0.98c
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College Physics

College Physics


Edition: 1st
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lyalllyall
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Chery Author
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#2
7 years ago
I needed this so much, thanks
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#3
5 years ago
Thank you so much
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#4
A year ago
At what speed would an observer in Alpha see the galaxy Beta moving?
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#5
A year ago
Quote from: baymee (A year ago)
At what speed would an observer in Alpha see the galaxy Beta moving?
0.70 c

This is true just by symmetry, there is no relativistic addition between these two. That would become necessary if you were asking what gamma looked like from alpha.
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