Xandu is also travelling in the area and is passing Yvette and Zandor. He is tra
ID: 2077996 • Letter: X
Question
Xandu is also travelling in the area and is passing Yvette and Zandor. He is travelling at a velocity of 0.7c relative to Yvette and in the same direction as her. He sees Zandor take the shot at the rubbish bin. and immediately knows he is shooting for the bin. Not to be outdone, he throws his drink at the bin too. Assume that Xandu throws from a distance of 1km to the rubbish bin in Xandu's reference frame, and throws the drink at a velocity of 0.3c forward with respect to his direction of travel. (a) At what velocity does Zandor see Xandu's drink fly at the rubbish bin? (b) If Zandor was 450m from the rubbish bin in his reference frame when he threw his space junk at a velocity of 0.3c forward, at what point in time does Zandor think he threw his junk? When does Xandu throw his drink in his reference frame, if both bits of rubbish reach the rubbish bin at exactly the same time? (c) Where does the event Xandu throws his drink take place in Zandors reference frame?Explanation / Answer
Velocity of Xandu = 0.7c
Xandu passes by Yvette and Zandor
distance between Xandu and rubbish bin =1km and velocity of rubbish= 0.3c
a) velocity of Zandor = 0.7c-0.3c= 0.4c because Xandu passes relative to Zandor at the velocity of 0.7c
b) Zandor distance=450m , velocity= 0.3c
velocity = ditance/ time
so time =distance/ velocity = 450/0.3= 1500sec
t1= 1000/0.7= 1428sec and t2= 1500sec
total time= t1 + t2 = 1428 + 1500 =2928 sec
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