Question $7$

$15$ pts

Consider a cubical spaceship flying past you at relativistic speed along the horizontal direction, when you are observing it from the ground.

A$.$ The astronauts in the spaceship measure each side of the cubical spaceship as $25$ m $,$ this will be

$[$ Select$]$

B$.$ If the ship is traveling at $93\%$ of the speed of light relative to you, you will measure the length of the side of the spaceship along its direction of motion as $[$Select$]$ m$.$

C$.$ To you, the spaceship will appear like $[$Select$]$

D$.$ If an astronaut in the spaceship flashes light for $5\mathrm{.}00$ s in their frame of reference of the ship, you will observe the flash to last for $[$ Select$]$ s$.$ The speed at which the light flash will travel toward you will be $[$ Select$]$