Equations Flashcards

1
Q

Equation for Kepler’s Third Law

A

p^2 = a^3

p = planet’s orbital period in years
a = semi-major acid in AU

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2
Q

Newton’s Universal Law of Gravity

A

F = GMm/r^2

F = force of gravity
G = “big G”
M = bigger mass
m = smaller mass
r = radius; distance between centers of big and small masses

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3
Q

Newton’s Version of Kepler’s Third Law

A

M * P^2 = 4pi^2 / G * a^3

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4
Q

What does AU stand for?

A

Astronomical Unit - Distance from the Sun to the Earth

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5
Q

Value for Speed of Light

A

3.00 * 10^8 m/s

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6
Q

Brightness of Stars (to Determine Distance to Stars)

A

B = L / 4piD^2
Brightness = Luminosity/(Distance)^2

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7
Q

Stefan-Boltzmann Law

A

L = 4piR^2óT^4

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