Question

An observer is standing on the station platform when a high-speed train passes through at ?=0.9438c.  The observer, who measures the platform to be exactly ??=68m, notices that the front and back of the train simultaneously line up exactly with the ends of the platform.

NOTE: For the speed of light, use exactly ?=299792459 m/s

(a) What is the length of the platform, according to an observer on the train?

?′?= mm

(b) What is the length of the train, according to an observer on the train?

?′?= mm

(c) How much time does the observer on the platform measure for the train to pass a single fixed point on the platform?

Δ?=  

Answer 1