Orders of Magnitude ptys 206-2 29 January 2008
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27.02.2018
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Bu səhifədəki naviqasiya:
How many piano tuners are there in Chicago
How many hours does a piano tuner work per year
How often are piano’s tuned 1 per year
There must be 125 tuners to do 125,000 tunings/year.
Aside on Stars, Galaxies, and the Universe
Orders
of Magnitude
PTYS 206-2
29 January 2008
Example 1: The National Debt
Example 3: Chickens
Example 4:
Piano Tuners in Chicago
How many piano tuners are there in Chicago?
How many people in Chicago?
How many people per household?
How many households have pianos?
How often are piano’s tuned?
How long does it take to tune a piano (include travel)?
How many hours does a piano tuner work per year?
Example 4: Piano Tuners in Chicago
How many people in Chicago? 5,000,000 = 5106
How many people per household? 2
How many households have pianos? 1/20
How often are piano’s tuned? 1
per year
How long does it take to tune a piano (include travel)? 2 hours
How many hours does a piano tuner work per year? 2000
# of Tunings/year = (5106/2) (1/20)=125,000
Average tuner does = 2000 hours/2 hours = 1000 tunings
There must be 125 tuners to do 125,000 tunings/year.
Example: Drake
Equation
How many civilizations are there in the Universe that we can communicate with?
Aside
on Stars
, Galaxies,
and the Universe
Galaxies
Drake Equation
Drake Equation
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