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1. In the experiment to verify time dilation by ?ying the cesium clocks around the Earth, what is the order of the speed of the four clocks in a system ?xed at the center of the Earth, but not rotating?

2. Can you think of an experiment to verify length con- traction directly? Explain.

3. Would it be easier to perform the muon decay experiment in the space station orbiting above Earth and then compare with the number of muons on Earth? Explain.

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