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Phases of the Moon

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Phases of the Moon Half of the moon is always illuminated Half of the moon is always illuminated We see all, none, or some of that illumination The same ... – PowerPoint PPT presentation

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Title: Phases of the Moon


1
Phases of the Moon
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Half of the moon is always illuminated
4
Half of the moon is always illuminated
We see all, none, or some of that illumination
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The same side of the moon always faces the Earth.
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The same side of the moon always faces the Earth.
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The same side of the moon always faces the Earth.
Time for one rotation (axis)
Time for one orbit (Earth)

10
Half of the moon is always illuminated
We see all, none, or some of that illumination
11
Half of the moon is always illuminated
- But its not always the same half!
We see all, none, or some of that illumination
12
A few notes for the take home...
C
4p2
___
________
a3
p2
p2
MEarth
G(MEarth)
p period (time for Moon to go around Earth)
a Moon-Earth distance
Take home 1 If M becomes 0.5M, what is the new
value of p?
13
A few notes for the in-lab...
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A few notes for the in-lab...
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A few notes for the in-lab...
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A few notes for the in-lab...
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A few notes for the in-lab...
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A few notes for the in-lab...
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A few notes for the in-lab...
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p2 a3
p period in Earth years for one orbit around the
Sun a distance in AU from the planet to the Sun
23
4p2
________
a3
p2
G(M1M2)
G gravitational constant 6.67 x 10-11 m3/kg/s2
MSun 1.99 x 1030 kg
MPlanet ltlt MSun
4p2
________
a3
p2
G(MSun)
4p2
________
seconds ? years
1
G(MSun)
meters ? AU
24
GM1M2
_______
F
d2
F force that the Moon feels as it orbits
the Earth
M1 Earths mass
M2 Moons mass
d distance between Earth and Moon
If d stays the same, what happens to F if Earths
mass decreases?
25
4p2
________
a3
p2
G(M1M2)
G gravitational constant 1.475 x 10-34
AU3/kg/day2
MEarth 5.97 x 1024 kg
MMoon 7.36 x 1022 kg
p period in days of the Moons orbit around
Earth
a distance in AU between Moon and Earth
1 AU
_____________
400,000km x
a
.002667 AU
150,000,000km
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