Lecture17_gravity - Gravity F is proportional to m1 X m2 r2...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Gravity F is proportional to m1 X m2 r 2 m1 and m2= masses r= distance between them Page 322 Average gravity: 9.8 ms -2 = 9.8×10 5 mgal
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
To a first approximation the earth’s shape is a sphere.
Background image of page 4
We may describe the shape of the earth by a set of three increasing levels of sophistication. The simplest is a sphere, not rotating, covered by a universal ocean (i.e., no differences in elevation of the surface).
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Secondly, let’s add the effect of the earth’s daily rotation, which is to cause the equatorial region to bulge while flattening the polar regions. We also add layering to the earth (crust, mantle, and core). This more sophisticated model, the spheroid , describes the actual shape of the earth quite accurately.
Background image of page 6
Our third refinement retains the idea of a universal ocean. What is the position of sea level in the interior of a continent? It would be as though a slot canal were to connect from the ocean to that continental interior point, as illustrated here where the Corinth Canal in Greece connects to the Aegean Sea.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 28

Lecture17_gravity - Gravity F is proportional to m1 X m2 r2...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online