A spacecraft length is 300 meters in its onw frame. It moves at velocity v=4/5 c

Question

A spacecraft length is 300 meters in its onw frame. It moves at velocity v=4/5 c relative to earth or sun, what is the length in the earth or sun's frame?

a)180 meters

b)240 meters

c)300 meters

d) 375 meters

e)500 meters

part 2) If the length of spacecraft is meassured by someone laying down and picking up a meters stick, placing the zero end at the previous one meter end, The number of times he lays down the meter stick becomes the length in meters. In his own frame (the spacecraft)how many times does he lay down the meter stick?

a)180

b)240)

c)300

d)375

e)500

Part3) According to someone on earth (or sun's frame), how many times does he lay down the meter stick?

a)180

b)240

c)300

d)375

e)500

Explanation / Answer

1) L = L0/gamma = 300*sqrt(1-(4/5)^2)= 180 m

2) since he is in the same frame as the spacecraft then 300

so c)

3)

it would be 180 m so a)

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