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BIOL 4673 Lecture 5: Lecture 5

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School
Acadia University
Department
Biology
Course
BIOL 4673
Professor
Alexandre G R O S J E A N

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Document Summary

Oceanic tides: high tides, low tides, example: the bay of fundy in nova scotia has the largest tidal range in the world. Tides and the forces that generate them: tides are caused by the gravitational force of the moon and sun and the motion of earth, the wavelength of tides can be half the circumference of earth. Tides are the longest of all waves: tides are forced waves because they are never free of the forces that cause them. Moon is spinning around, slight centrifugal force, bulge of water around the planet due to the relative motion of the earth and moon and gravity. The equilibrium theory of tides: the action of gravity and inertia particle at five different locations on earth. Forces are balanced only at point ce, the center of earth. Note the bulges that are aligned with the moon as earth spins on its axis.

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Related Questions

I heard you on ABC Breakfast talking of the full moon effect. Ihave suffered in no small way from it all my life and medicatemyself to sleep in a full moon, otherwise I don't sleep. As anengineer and science interested person I have thought a lot aboutthis phenomenon and have come up with a theory, which I'm verysurprised has not been considered previously. You said in yourarticle that gravity was excluded as a factor, but this is not thecase. Gravity is affected by the mass of the moon and it'sproximity to your location. The tides have complex interactionswith the earth and the sun, so making conclusions from the tidesalone is not always valid in relation to gravitational forces.Lakes are not tidally affected because there is no where for thewater to go. The ocean tidal waters don't go up and down like abath tub level, they go in and out like the waves on a beach. Iconclude that the increase of the gravitational force makessensitive people restless, and hence in a sleep lab, they are stillexposed to gravitational changes. I suggest the way to verify thisis to measure the gravitational force at different cycles of theearth and moon. I am also affected by air pressure in a similarway.When the air pressure is high, and it'sa full or near fullmoon, I'm unable to sleep without medication, and if I do partiallysleep, I have wild dreams. When the opposite is the case, I sleeplike the dead. Temperature is the other obvious variable thatexacerbates this cocktail of influences as well. Also, from anatural selection view, maybe we are restless at times of full moonas we are more visible to night predators, and need to keep morealert for that. As I said, I'm amazed that science hasn't resolvedthis question a long time ago. So much of nature is cycled by themoon.