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March 14th...giornata della matematica, Pi Greco day. Perchè non utilizzare le cifre di π per costruire una spirale, la spirale di Archimede, da appendere in classe o nel corridoio? Se appesa sopra un termosifone o un'altra fonte di calore, diventa una divertente attività ed esperimento con cui scoprire alcune caratteristiche dell'aria: la spirale ruota e si muove perchè spostata dall'aria calda. L’aria calda è più leggera dell’aria fredda perché meno densa e sale verso l’alto. https://maestramonica.it/pi-greco-day-la-spirale-di-archimede-matematica/
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#sailingfamily #travel #boatlife #shorts #bahamas #caribbean #sailing
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The Earthling E40 Hybrid Power Catamaran. We met the Earthlink team recently in Barcelona to take a look at the innovative systems on the E40 E-Propulsion Power Cat. John McGettigan motored the boat from Genoa to Barcelona (650 nm) single handed. ▫️ What do you think? ▫️ 10 Key Points: A cutting-edge hybrid-electric catamaran with top engineering standards. . Designed by @johnmcgettigan66, it's powered by twin Molabo electric motors and a 45kWh lithium battery system supported by a 2kW solar array. . On battery alone, Earthling can cruise silently for up to 40 nautical miles at lower speeds, or 20nm at 8 knots, and 18nm at 10 knots—the "sweet spot". . Two diesel-powered 8.5kW Whisperpower Genverters provide hybrid range extension and can run on biofuel. . Hulls are ultra-light (12m/3.6 tonnes) and based on the Stealth 36 powercat design, built with carbon composites for max efficiency. . Large 600mm propellers spin slowly (400–600rpm), optimised for quiet, efficient cruising at 10 knots. . Full recharge takes just 2 hours from shore power or 3 days from solar at anchor or at the dock. . The entire boat is run by E-Thos, a smart remote-control system that manages power, navigation, and amenities with real-time alerts. . Interior is single-level, open-plan, with smart use of space and 5 berths—perfect for weekend getaways . The E-40 aims to set a benchmark in eco-friendly boating: silent, clean, energy-efficient, and ready for the next generation of boaters. . #electric #hybrid #yacht
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⚓️ https://scanboat.com/en/boat-market Sellers and buyers meet on scanboat
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