In Figure 1a, a cosmonaut measures the time interval Ato between successive ticks of his clock. In Figure 1b, an earth-based observer measures a time interval At between ticks that is greater than Ato. The spaceship is moving past the earth at a constant speed v that is 0.90 times the speed of light. In other words, v= 0.90c. The cosmonaut measures the time interval between successive "ticks" of the spaceship clock to be Ato = 1.0 s. Determine the time interval At measured by the earth-based observer. Ato D (a) S 20 L At Figure 1 (b) S L
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