a) Discuss the statement "the Aether model posed a challenge to the Principle of Relativity. Einstein's response to this challenge increased humankind's understanding of the physical universe" b) An astronaut in a spacecraft tied her mascot to a string and hung it from the ceiling. One day she noticed that instead of hanging straight down, it hung at an angle. i) Account for this.ii) Identify the frame of reference when it hangs down. Justify your answer. Identify the frame of reference of the spaceship when the mascot hangs at an angle. Justify your answer.

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