Chapter 4 Review
Chapter 4 Review ASTR-1010-01
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This 1 page Class Notes was uploaded by Raven Hamilton on Friday February 19, 2016. The Class Notes belongs to ASTR-1010-01 at Clayton State University taught by Bram Boroson in Spring 2016. Since its upload, it has received 30 views. For similar materials see Solar System Astronomy in Art at Clayton State University.
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Date Created: 02/19/16
Astronomy Chapter 4 Review The Moon’s effect on the tides is stronger than the Sun’s. Tides, high and low, have the greatest contrast when the moon is in full and new phases. High tides are highest and low tides are lowest during these phases. There are two tidal bulges. One faces towards the Moon because that is where the gravitational attraction is the strongest. The second arises because gravity weakens with distances and essentially stretches the Earth along this line. Any particular location on Earth experiences two high tides and two low tides a day Tides affect land, however land rises and falls in a smaller amount than the oceans do. The Moon is constantly falling towards Earth. The force of gravity is an inverse square law. This means that, if you double the distance between two large masses, the gravitational force between them weakens by a factor of 4. Newton’s laws were significant because they explained why gravity is important in orbits. He said that orbits go around a center of mass, orbits do not have to be an ellipse and have an escape velocity, and lastly p(squared)= a (cubed) taken from Kepler’s third law. The third part took into account the mass in the center. A collapsing cloud of interstellar gas, which is held together by the mutual gravitational attraction of all the atoms and molecules that make up the cloud. As the cloud collapses, the overall force of gravity drawing the cloud inward gradually becomes stronger because the strength of gravity follow the inverse square law with distance. As the cloud shrinks in size, its rate of rotation speeds up because the total angular momentum is conserved. In 8.3 minutes, light travels the distance of 1 astronomical unit. (excerpt from Ch. 1)
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