Lecture1

# Lecture1 - Lecture 1: Introduction Ph 1a Click to edit...

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Click to edit Master subtitle style 2/23/11 Lecture 1: Introduction Ph 1a Fall 2010

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2/23/11 Coordinates Jonas Zmuidzinas 306 Cahill x6229 jonas@caltech.edu http://www.its.caltech.edu/~tmu/ph1a Course calendar (HW, quizzes, final) HW assignments
2/23/11

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2/23/11
2/23/11 Dimensions and units Dimensions: time, length, mass, energy… Units SI: second, meter, kilogram, Joule… US customary: second, foot, pound (avoirdupois), Calorie… Conversions 1 foot = 0.3048 m

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2/23/11 Mars Climate Orbiter JPL mission Built and operated by Lockheed-Martin Launched on December 11, 1998 Crashed on Mars
2/23/11 Examples How many seconds per year ? Miles per gallon vs meters per mL

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2/23/11 Units of Time Earth’s orbit – seasons, year Moon’s orbit – months Earth’s rotation – day/night Hours: since 2000 BC, Egyptians Minutes, seconds: al-Biruni, circa 1000 AD
2/23/11 Measurement of Time Water clocks – 16th century BC 10-2, or 1% accuracy (15 minutes per day) Mechanical clocks – 13th century AD,

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## This note was uploaded on 02/22/2011 for the course PH 1a taught by Professor Goodstein during the Fall '07 term at Caltech.

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Lecture1 - Lecture 1: Introduction Ph 1a Click to edit...

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