ses100lec4

# ses100lec4 - thunderstorm in cubic meters? • Volume =...

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1 SES100 Units Significant figures Length Time Velocity Mass Srikanth Saripalli

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2 Units • SI (International System) • meter, kilogram, second • U.S. Customary • foot, pound, second
3 International System of Units (SI)

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4
5 Significant Figures Addition/subtraction Last significant digit in sum is the digit that is common to all numbers being added 3.51 1.42 + 2.3 = ? 7.2 Multiplication/division Result has number of digits as the least number in any value Example: Potential energy = m * g * h = 5.43248 kg * 9.80665 m/sec 2 * 2.1 m = ? = 111.9 ? NO ! = 110 kg m 2 /sec 2 ( 110 J)

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6 Length-related Topics • Outline • Coordinate systems • Area and volume formulas • Trigonometric relationships • Estimating area and volume
Cartesian system (x,y,z) Cylindrical system (r, θ ,z) Spherical system (r, θ , φ ) Coordinate Systems

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Area Formulas * * *
Area Formulas * * *

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Volume Formulas * * *
11 Trigonometric Relations

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12 Unit Conversion (and estimating) • What is the volume of water in a typical Arizona

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Unformatted text preview: thunderstorm in cubic meters? • Volume = Area * Thickness • Area = ? • Thickness = ? How do you estimate this? • 5 miles * 5 miles * 2 inches • Unit conversion = 5 miles * 5,280 feet mile * 1 m 3.28 feet * 5 miles * 5,280 feet mile * 1 m 3.28 feet * 2 inches * 1 m 39.37 inches = 8,000 m *8,000 m *0.05 m = 3,000,000 m 3 mass = 3,000,000 m 3 *1000 kg m 3 = 3*10 9 kg = 2.5*10 6 tons 13 Problem • What is the angular size of your thumbnail at arms length? • The Moon is 250,000 miles from Earth • What is the diameter of the Moon? 14 Essential Concepts 1) Units 2) Significant figures 3) Unit conversion and estimating 4) Coordinate systems 5) Trigonometric relationships, angles, arc length, radius 6) Area, volume calculations and formulas 7) Estimating area and volume Coordinate systems...
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## This note was uploaded on 03/06/2011 for the course SES 100 taught by Professor Saripalli during the Spring '09 term at ASU.

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ses100lec4 - thunderstorm in cubic meters? • Volume =...

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