[填空题]
A friend speeds by yo 57xy/(dwt/fop9fbk p u in her "Ferrari"4rvj.: jn fo3x spacecraft at a speed of 0.660c. It is measured in your frame to be 4.80 m long and 1.25 m higj:4o xjrv nf3.h.
(a) What will be its length and height at rest?
$L_0$ = m
the rest height is m
(b) How many seconds would you say elapsed on your friend's watch when 20.0 s passed on yours? $\bigtriangleup t_0$ = s
(c) How fast did you appear to be traveling according to your friend? c
(d) How many seconds would she say elapsed on your watch when she saw 20.0 s pass on hers? s
