EAS212 Lecture Notes - Lecture 19: Centrifugal Force

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What are tides: they continuously raise and lower the sea surface, they are long period waves. Low tides = wave trough: can be 10-15m high, twice a day sometimes, currents are associated with tidal processes. Incoming currents associated with rising tides = flood currents. Outgoing currents associated with decreasing tides = ebb currents. Slo(cid:449)l(cid:455) (cid:272)ha(cid:374)ges ea(cid:396)th(cid:859)s (cid:396)otatio(cid:374) a(cid:374)d le(cid:374)gth of da(cid:455) Causes the moon to slowly move away from the earth. Keeps the same face of the moon always facing the earth: they influence the orbits of satellites. What causes tides: gravity, ne(cid:449)to(cid:374)(cid:859)s la(cid:449) of g(cid:396)a(cid:448)itatio(cid:374)al att(cid:396)a(cid:272)tio(cid:374) states that g(cid:396)a(cid:448)itatio(cid:374)al att(cid:396)a(cid:272)tio(cid:374) (cid:271)et(cid:449)ee(cid:374) (cid:1006) (cid:271)odies is: Directly proportional to their masses; heavier mass = strongly gravitational attraction. Inversely proportional to the square of the distance between the 2 bodies: tidal forces are based on gravitational attractive force. They vary inversely as the cube of the distance between the objects.

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