OCNG 251 Lecture Notes - Lecture 9: Tide Pool, Wind Wave
8 May 2017
School
Department
Course
Professor
Document Summary
Tides= shallo(cid:449) (cid:449)ater (cid:449)a(cid:448)es (cid:449)ith huge (cid:449)a(cid:448)ele(cid:374)gths (cid:894)(cid:1005)(cid:1004)(cid:1004)(cid:1004)"s of k(cid:373)(cid:895), (cid:271)ut s(cid:373)all (cid:449)a(cid:448)e height. First mentioned in writing around 450 bce, but finally understood when newton. Iii. described the laws of gravity and how they relate to tides in 1687. Caused by gravitational attractions between earth, moon and sun. Commercial reasons: influence on shipping, sailing, etc. Biological reasons: interesting critters that live in tide pools, chaotic ecology. Good model system for life under changing conditions because they go from dry to submerged under water multiple times a day. The earth and the moon rotate together as one system around the sun. The (cid:373)oo(cid:374) does(cid:374)"t te(cid:272)h(cid:374)i(cid:272)ally rotate arou(cid:374)d the earth, they rotate arou(cid:374)d ea(cid:272)hother: but since the earth is much larger, the balance point (barycenter) is within the earth. Fg= (gm1m2)/r2: fg= gravitational force, m1 & m2= masses of two objects, r= the radius of the distance between m1 and m2. G= 6. 7 x 10-11 m3/kg*sec2: g= gravitational constant.
