Lecture 1 - Introduction

# Lecture 1 - Introduction - Polpulation 3 10 Families 1 10...

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Introduction

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Jack and Jill went up the hill To fetch a pail of water. Jack fell down and broke his crown and Jill came tumbling after.

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Every physical quantity has units . .. laws of people dimensions . .. laws of nature
Units English (traditional) French ("scientific") Time (both systems) 1 sec: m, hr, day, month year 1 sec: millisecond, microsecond, nanosecond f p

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( 29 Converting 1.6 km 1 mile 1.6 km mile or, 1 mile = 1 1.6 km = 1.6 km × =
6 6 6 6 Tire tread Diameter 1 meter distance/revolution 3 meters/revolution Lasts 40,000 miles 60 10 m 60 10 m Number of revolutions 3m / revolution 20 10 revolutions 1cm Tread thickness/revolution 20 10 r × × × × : : : : : : : 10 evolutions 5 10 m/revolution - × :

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6 6 6 How many piano tuners live in Chicago?

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Unformatted text preview: Polpulation 3 10 Families 1 10 Assume one-third of families have a piano Number of pianos tuned per year 0.1 10 Each piano tuner can tune two per day x 250 days per × × × : : : 5 year 500 pianos per year 10 pianos tuned per year Number of piano tuners 500 pianos tuned per year per piano tuner 200 piano tuners : : : ( 29 ( 29 ( 29 1 5 5 2 2 1 2 5 5 Dimensions G. I. Taylor: expanding fireball ( magazine) depends on and so 2 1 log log log 5 5 deduce 20kT Life r t E E l E r t t t E r t c t E r t E ρ = = + : : : Dv R ρ η =...
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Lecture 1 - Introduction - Polpulation 3 10 Families 1 10...

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