(Answered) You are relaxing on the beach when your friend suddenly

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You are relaxing on the beach when your friend suddenly zooms by in an extremely fast powerboat. Suppose (unrealistically) that the powerboat moves at relativistic speeds. The instant the powerboat passes right in front of you, both you and your friend get the same idea to play "Ride of the Valkyries" on your respective stereo systems. Your recordings are identical. In your friend's frame, whose recording finishes first?

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