Abstract
A rotational rocket is the angular analogue of the familiar translational rocket. It spins about an axis fixed in position, as a result of the ejection of matter (typically in the form of one or more fluid jets) tangentially from its rim. Examples include a rotary lawn sprinkler, Hero’s engine, or a carousel off of which balls are thrown. The thrust equation is developed starting from Newton’s second law for rotations. Special cases that could be used in class or homework in an introductory mechanics course are discussed.
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