What physics principle does Manuel use when he pumps in rhythm with the natural frequency of the

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What physics principle does Manuel use when he pumps in rhythm with the natural frequency of the swing?

What physics principle does Manuel use when he pumps in

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Conceptual Physical Science

ISBN: 978-0134060491

6th edition

Authors: Paul G. Hewitt, John A. Suchocki, Leslie A. Hewitt

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