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Formula Sheet Test one
Rebecca Densen
(10ˆa)x(10ˆb)=10ˆa+b
1 Light Year
= 63000Au or 9.5e15m
speed of light
=3e8m/s
Angular size of sun/moon
=1/2˚
1Au
=1.5e11m, 1.5e8m
‘
=arcmin
“
=arcsec
1˚
=60’ 1’
=60”
G
=6.67e11Nmˆ2/ kgˆ2 or mˆ3/sˆ2kg
Newton’s law of Universal gravity
 Fg=GMm/rˆ2
Fg=newtons M=mass of large m=mass of small rˆ2=distance to sun
Orbital velocity
 Vcˆ2=GM/rm/s
Orbital Period
 P=2πr/Vc—s
Newton’s 2
nd
law
F=ma
Escape Velocity
 Vesc=√2G/R
Small Angle Formula

Angle diameter(arcsec)/206,265=linear diameter/distance
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This note was uploaded on 10/11/2011 for the course PHY 121 taught by Professor Weinstein during the Fall '08 term at SUNY Buffalo.
 Fall '08
 WEINSTEIN
 Gravity, Light

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