Lecture17_gravity

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

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

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

View Full Document
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

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

View Full Document
To a first approximation the earth’s shape is a sphere.
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).

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

View Full Document
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.
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.

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 07/07/2010 for the course GEO geo taught by Professor Long during the Spring '10 term at University of Texas.

### 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
Ask a homework question - tutors are online