Question: A frame-by-frame analysis of slow-motion video shows that a hovering dragonfly takes 7 frames to complete one wing beat. If the video is shot at

A frame-by-frame analysis of slow-motion video shows that a hovering dragonfly takes 7 frames to complete one wing beat. If the video is shot at 240 frames per second,
(a) What is the period of the wing beat,
(b) How many wing beats does the dragonfly perform per second?

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