ASTR-1010 Lecture Notes - Lecture 6: Tidal Acceleration, Orbital Period, Electromagnetic Spectrum
19 Feb 2017
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I(cid:374)(cid:272)e gra(cid:448)itatio(cid:374)al for(cid:272)e de(cid:272)reases (cid:449)ith dista(cid:374)(cid:272)e^2, the moo(cid:374)"s pull o(cid:374) earth is stro(cid:374)gest o(cid:374) the side facing the moon, and weakest on the opposite side. The earth gets stretched along the earth-moon line. The oceans rise relative to land at these points. Is when the rotation period of a moon ,planet, or star equals it orbital period about another object. Due to tidal friction he moon now rotates synchronously with its orbit around earth: we always see the same side of the moon. Motio(cid:374) (cid:272)a(cid:374) (cid:271)e u(cid:374)derstood through ne(cid:449)to(cid:374)"s three la(cid:449)s. co(cid:373)(cid:271)i(cid:374)ed (cid:449)ith the theor(cid:455) of gra(cid:448)it(cid:455), (cid:449)e (cid:272)a(cid:374) e(cid:454)plai(cid:374) (cid:449)h(cid:455) thi(cid:374)gs fall kepler"s la(cid:449)s of pla(cid:374)etar(cid:455) or(cid:271)its, et(cid:272). Ne(cid:449)ton"s disco(cid:448)eries showed that the same physical laws we observe on earth apply throughout the universe. This is a tool for measuring the masses of distant objects! We can understand many processes in the universe by following how energy changes from one form to another.
