Train ever totally in the tunnel
A super-train of appropriate length of 96 m travels at a speed of 0.94c as it passes via a tunnel encompassing proper length 50 m. As seen by a track-side observer, is the train ever totally in the tunnel?
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The astronaut at rest on Earth has a heartbeat rate of 72 beats per minute. If the astronaut is traveling in a spaceship at 0.90c, then what will the rate be as measured by the given:
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