p38_023 - notation of Eq. 38-28, the problem indicates v =...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
23. (a) One thing Einstein’s relativity has in common with the more familiar (Galilean) relativity is the reciprocity of relative velocity. If Joe sees Fred moving at 20 m/s eastward away from him (Joe), then Fred should see Joe moving at 20 m/s westward away from him (Fred). Similarly, if we see Galaxy A moving away from us at 0 . 35 c then an observer in Galaxy A should see our galaxy move away from him at 0 . 35 c . (b) We take the positive axis to be in the direction of motion of Galaxy A, as seen by us. Using the
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: notation of Eq. 38-28, the problem indicates v = +0 . 35 c (velocity of Galaxy A relative to Earth) and u = . 35 c (velocity of Galaxy B relative to Earth). We solve for the velocity of B relative to A: u = u v 1 uv/c 2 = ( . 35 c ) . 35 c 1 ( . 35)(0 . 35) = . 62 c or u = 1 . 87 10 8 m / s....
View Full Document

Ask a homework question - tutors are online