 #1
billllib
 77
 2
 Homework Statement:
 (b) Where does this event occur in Alice’s frame of reference?
 Relevant Equations:

d = vt
x' = x  vt
Consider Bob in a vehicle moving to the right (positive x direction) at a speed of 100 km/hour with respect to Alice, who is observing Bob go by. Bob passes Alice at time t = 0, and at that instant he observes a flash of light that occurs at a distancexB=25 kilometersahead of him (in his direction of travel). (Remember what “to observe” means: the event is recorded via one of the clocks in a lattice of synchronized clocks in the observer’s frame of reference.
(a) Where does this event occur in Alice’s frame of reference?
Bob continues to travel at 100 km/hour for 30minutes, at which point he observes another flash of light at a distance of 25 km ahead of him.
(b) Where does this event occur in Alice’s frame of reference?
I just have a question about question b.
In order to find b answer I take
current_location_of_Bob = vt = (100)(.5)= 50
current_location_of_second_flash = 25
distance_away_from_Alice= 25 + 50 = 75
Is there a formula to solve this?
what is the different situations when I use d = vt vs Galilean transform?
Also the Galilean transform is only used when I want B to be the stationary observer instead of A in a spacetime diagram?