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Lecture 20-23 Waves

# 50 per kw but dont get the constant power 39 5 tides

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Unformatted text preview: gravity, F=GMm / r2 l༆  And so despite the huge size, the eﬀect of the sun on Hdes is just less than 50% of the moon’s 28 l༆  hMp://www.youtube.com/watch?v=EnDJ6_XpGfo&feature=related - Hopewell Rocks, NB l༆  Wavelength of the Hde? 50% of the circumference of Earth or 20,000km approx… 29 l༆  Tide is a forced wave, not a free wave due to unending inﬂuence of gravity l༆  We talk about a theoreHcal model of the Hde – the equilibrium theory 30 l༆  Due to moon’s rotaHon around Earth each high Hde takes place 12 hrs and 25 minutes ayer the previous…so high Hde moves approx. 50 minutes each 24 hrs l༆  Centre of gravity for Earth/moon system is towards the Earth’s core - 1,650km inside the Earth, not at centre or surface so we get a bulge on both sides of the Earth (p.242) l༆  Speed of the wave? l༆  Circumference of the Earth / 25h 50 mins….or 1,600kmhr- 1 31 5. Spring and neap Hdes 32 l༆  Both celesHal bodies impact…+20% l༆  However moon’s not in the same plane and moves…±28.5° l༆  So Hdes are never uniform 33 l༆  There are in fact dozens of inﬂuences…winds, relaHve celesHal bodies, relaHve distance from sun, Earth… posiHons of conHnents…. l༆  Recall northern hemisphere is closest to the sun in winter and therefore highest high Hdes are at that Hme 34 Dynamic Theory of Tides l༆  Life mor...
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