Example:A rod of 1m is 45 degrees to the horizon in S'system,How about its incline angler measured in s system？(v=√3C/2) solution: -1c0os0 ly==I'sin 0 1,=V1-v2/c2=1cos0V1-v2/C2 1=Vg+=1V1-/C2cos20=0.79m) 1'sinθ t8= I'cos01-v/C2 =20=6327 solution： S S´ ´ Example: A rod of 1m is 45 degrees to the horizon in S’ system, How about its incline angler measured in s system?（ v  3C 2 ） l  lcos x l  l  lsin  y y 2 2 2 2 l x  l x  1 v C  lcos 1 v C 2 2 x y l  l  l 1  cos 0.79( ) 2 2 2  l  v C   m 2 cos 1 sin 2 2         l v C l l l t g x y      6327