Suppose our sun is about to explode. in an effort to escape, we depart in a

spaceship at v = 0.80c and head toward the star tau ceti, 12 lightyears away.

when we reach the midpoint of our journey from the earth, we see our sun

explode and, unfortunately, at the same instant we see tau ceti explode as well.

a) in the spaceship’s frame of reference, should we conclude that the two

explosions occured simultaneously? if not, which occured first?

b) in a frame of refernece in ehich the sun and tauceti ar at rest, did they

explode simultaneously? if not, which exploded first?

uranium fissions/breaks up giving out energy and neutrons

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2