AST 101 Sept.docx

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Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Michael Reid
Semester
Fall

Description
AST 101 Sept.20 Newton’s law of Gravity: The force of gravity between masses M and m is equal to the product of their masses, times the gravitational constant G, divided by the square of the distance between them Mass: the total number of atoms something has. Orbits: Why does the moon orbit, and not fall into the earth? Because the moon is moving perpendicular to the force of gravity. Minimum speed required to orbit: Vorbital. An object moving under the influence of gravity alone is free fall. Vcircular: bigger speed than Vorbital. Escape speed is the speed at which something has to be thrown to escape earth’s gravity. Vescape = 1.4 x Vcircular Tycho Brahe charted the position of all the planets. Tycho’s student, Johannes
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