Some dragonflies splash down onto the surface of a lake to clean themselves. After this dunking, the
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Some dragonflies splash down onto the surface of a lake to clean themselves. After this dunking, the dragonflies gain altitude, and then spin rapidly at about 1000 rpm to spray the water off their bodies. When the dragonflies do this "spin-dry," they tuck themselves into a "ball" with a moment of inertia of 2.6 × 10-7 kg·m2. How much energy must the dragonfly generate to spin itself at this rate?
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I am Dr. Anup Biswas. I did my MSc in Chemistry from Indian Institute of Technology-Kharagpur, a pioneering educational institute in India. I completed my PhD in Organic Chemistry from University of Muenster, Germany. I am engaged in online tutoring for last 6 years and have taught students of different curriculum, grades all across the globe. Teaching is my passion and I love to help my students solving the academic difficulties. My way of tutoring is to focus on problem solving methods which I think is the best way to learn the subject.
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