A space probe has an 24.7-m length when measured at rest. What length does an observer at rest measure when the probe is going by at a speed of 0.860c?
a. 25.2 m
c. 9.19 m
b. 6.43 m
d. 12.6 m
Question 2
According to the special theory of relativity, which of the following happens to the length of an object, measured in the dimension parallel to the motion of its inertial frame of reference, as the velocity of this frame increases with respect to a stationary observer?
a. the length remains constant
b. the length vanishes to zero when velocity equals half the speed of light
c. the length increases
d. the length decreases
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