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February 29, 2008

# February 29, 2008 - o As the cloud collapses(due to gravity...

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February 29, 2008 EXAM #2 IS NEXT FRI MARCH 7 REVIEW TIMES WEDNESDAY MARCH 5 TH 7-8:30 DUANE G125 THURSDAY MARCH 6 TH 8-9:30 RAMELAY??? Clicker question: what is the frost line? o The distance from the sun in the solar system where temperatures are cold enough from water/ice to condense Collapse of the solar nebula o As the solar nebula collapsed it Spun faster Heated up Flattened out into a disk Why did it spin faster? o Conservation of angular momentum MxVxR=constant M=mass V=velocity R=radius Clicker question: if angular momentum is constant (MxVxR), what happens if R goes down (no change in M) o V goes up Why did it heat up? o Gravitational energy => kinetic energy => thermal energy Why did it flatten into a disk?
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Unformatted text preview: o As the cloud collapses (due to gravity) the gases, dust and stuff orbit the central mass For individual orbits, gravity still balances that centrifugal force Equal force pulling in as pushing out o Oblique collisions => flatter orbits When they run into each other they average out their motions and go in one direction o Head-on collisions => small objects They become smaller objects because they break each other apart o Small random motions average out to a tiny bulk motion This bulk motion is then “amplified” (due to conservation of angular momentum) as the cloud collapses o Everything moves in the same direction or it gets smashed and destroyed...
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