Lecture 3 - Dimensions, Units, Significant Figures

Lecture 3 - Dimensions, Units, Significant Figures -...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1/18/2010 1 TODAY’S TOPICS: Engineering Measurements Dimensions, Units, and Conversions Engr 160 Chapters 4 and 5 How will learning this help me? Connect Your Background You will see how understanding units can help you better understand physical relationships and solve problems • You will understand what the number of significant digits means • You will be better prepared for Exam 1 Engr 160
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1/18/2010 2 Definitions Dimensions Used to describe physical quantities – Used to describe – Independent of units – Two types 1. Fundamental (length, time, mass, temperature, etc.) 1. L, t, m, T 2. Derived (combinations of fundamental dimensions) 1 V=DL/ 1. V = DL/t Units – Used to describe dimensions • Meters, seconds, kilograms, degrees C Engr 160 SI Units and Symbols Three types of units 1 Base 1. 2. Supplemental 3. Derived Seven types of Base Units 1. Length , meter (m) 2. Time , second (s) 3. Mass , kilogram (kg) , kilogram (kg) 4. Electric current , Ampere (A) 5. Temperature, Kelvin (K) 6. Amount of substance, mole (mol) 7. Luminous intensity , candela (cd) Engr 160
Background image of page 2
1/18/2010 3 Supplemental Units Two supplementary units 1. Plane angle, radian, rad 2. Solid angle, steradian, sr Engr 160 Derived Units Derived Units – Combinations of fundamental units • Velocity • Acceleration • Energy Length m V time s  2 11 ** Length m m a time time s s s 22 Length m Em a s s k g time s    • Electric Resistance Engr 160 1 1 */ a r g length m Rm a s s k g time time current s s A a s sv e l o c i t y c h e      
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1/18/2010 4
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/09/2012 for the course ENGR 160 taught by Professor Sengupta during the Spring '07 term at Iowa State.

Page1 / 11

Lecture 3 - Dimensions, Units, Significant Figures -...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online