The 500 m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500 m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would then be measured to be
a. 180 m.
b. 320 m.
c. 500 m.
d. 625 m.
e. 781 m.
Question 2
Captain Jirk reports to headquarters that he left the planet Senesca 1.88 104 seconds earlier. Headquarters sends back the message: Was that spaceship proper time? It will be spaceship proper time if it was
a. measured by one clock fixed at one spot on Senesca. b. measured by one clock fixed at one spot on the spaceship.
c. measured by a clock on Senesca at departure and by a clock on the spaceship when reporting.
d. measured by a clock on the spaceship when departing and by a clock on Senesca when reporting.
e. calculated by dividing the distance from Senesca according to Senesca by the speed of the spaceship.
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