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s) A 40 m spacecraft with 30-year-old astronauts who has the mass 80 kg moves with velocity v-0.95c w
respect of the Earth observer. After return the astronaut is 32-year-old. What is the time dilation, mass of the astronaut a
the length of the spacecraft for the observer on the Earth?
6. (
The flexible square loop shown in Fig. 4 has a
ength 20 T. The lo-

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