Level 127 Level 129
Level 128

Planetary Motion & Gravitational Constants


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g
(a) Abbreviation for gram. (b) When a lowercase italic g, the symbol for the acceleration due to gravity (at Earth's surface, 9…
6x10^24kg
Mass Earth
7.4x10^22kg
Mass Moon
1.75x10^6m
Rm (c to s)
6.4x10^6m
Re (c to s)
3.8x10^8m
re-m (c to c)
1.5x10^11m
1Au= rs-e (c to c)
1.991x10^30kg
Mass sun
Fg
GM1M2/r^2
Orbital Velocity
Square root: GMc/r
Ug
GM1M2/r
Escape Velocity
Square root: 2GMc/r
Kepler's 1st
Ellipse- path of planets are ellipse and the sun is at one foci
Kepler's 2nd
Area-imaginary line from sun to a planet sweeps out equal areas in equal time. Planets move fastest near sun(vice versa)
Periods-(Ta/Tb)^2:(ra/rb)^3
Kepler's 3rd
How to find Vesc
Use conservation of energy equation by setting infinity at ug:o