Lecture13 - Astronomy Picture of the Day An amazing outburst of Comet 17/P Holmes Announcements • Midterm exam next friday 25 questions 50

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Unformatted text preview: Astronomy Picture of the Day An amazing outburst of Comet 17/P Holmes Announcements • Midterm exam next friday: 25 questions, 50 minutes • Remember to bring a scantron form #288 • There are 10 left-handed desks in the room. If you want to reserve one for the midterm, please contact me by email. These will be reserved on a Frst-come, Frst-served basis. UCI Observatory • Public viewing night at the Observatory: next friday, November 2, 8-10 pm • I’ll give directions next week The Moon The Moon • Average Earth-Moon distance: 384,000 km • Mass is 1.2% of the Earth’s mass • Radius is 27% of the Earth’s radius • Weight of an object on the moon’s surface is about 17% of the weight of the same object on earth Tidal forces on the moon • The earth exerts tidal forces on the moon too Note: the tidal distortion of the moon in this Fgure is highly exaggerated! moon’s orbit this way Tidal forces on the moon b a a b Tidal forces on the moon • If the moon rotated rapidly about its north-south axis, then this tidal stretching would mean that the moon’s structure would constantly be stretched and squeezed by the tidal forces • This process would dissipate rotational energy over time Note: the tidal distortion of the moon in this Fgure is highly exaggerated! a b a b Tidal forces on the moon • The moon is now tidally locked to the earth in synchronous rotation • The moon’s rotation period is the same as its synodic orbital period • The same side of the moon is always facing the earth Note: the tidal distortion of the moon in this Fgure is highly exaggerated!...
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This note was uploaded on 04/20/2008 for the course PHYS 20A taught by Professor Staff during the Fall '02 term at UC Irvine.

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Lecture13 - Astronomy Picture of the Day An amazing outburst of Comet 17/P Holmes Announcements • Midterm exam next friday 25 questions 50

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