Question a circular spacecraft of diameter 3000 m passes, Ask an Expert

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Question: A circular spacecraft of diameter 300.0 m passes earth moving eastward at 0.9900c.

Question 1: What are the dimensions of the spacecraft according to the earthbound observer?

Question 2: according to this observer, what is lifetime of a neutron in the captain's chair on the spacecraft if a neutron at rest has a lifetime of 886s?

I want experts for above questions and thanks in advance.

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