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Units & Measurement. Things we measure…. Derived Units. Old English System Units… . Modern Units….

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Units & Measurement

Things we measure…

Derived Units

slide3

Modern Units…

Big Mac Index - a measure of exchange rates betweentwo currencies. It was defined by Economist\'s editor Pam Woodall to measure whether a currency is under or overvalued. She used a Big Mac because the burger is produced in about 120 countries.

Kardashian

A "Kardashian" is a unit of measure representing 72 days of marriage. This unit of time came in response to the 72 day marriage of Kim Kardashian to Kris Humphries.

Twitter followers: Wheaton

The Wheaton is a measurement of Twitter followers relative to celebrity Wil Wheaton. The measurement was standardized when Wil Wheaton achieved half a million Twitter followers, with the effect that Wil Wheaton now has 4 Wheatons himself. As few Twitter users have millions of followers, the milliwheaton (500 followers) is more commonly used.

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Why have Standards?

Order of Magnitude -

  • The height of a classroom door
  • The length of an ant
  • The height of a can of soda
  • The distance to Nassau Coliseum
  • 103m
  • 100m
  • 10-2m
  • 10-3m
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Conversions…

kg g

m cm

mm m

mg cg

km cm

g kg

5kg =

5m =

5mm =

5mg =

5km =

5g =

Dimensional Analysis -

How many seconds are in a year?

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Scientific Notation-

An electron in a conducting wire can travel at speeds of 5,652,000km/hr…

Convert this speed to m/s and then into scientific notation.

Why doesn’t the electron flow

in straight line like a water molecule in a pipe?

standard notation scientific notation
Standard Notation Scientific Notation

239,000 miles

2.5 x 108

24.8lbs

.0000000015m

5.0 x 10-3m

2.39 x 105

250,000,000

2.48x 101

1.5 x 10-9

.005

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