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Chapter 7 Book Notes

by: devuchka

Chapter 7 Book Notes ENGR 1300


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About this Document

These notes cover the reading for chapter 7.
Engineering introduction
Rosie Kellie
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This 2 page Bundle was uploaded by devuchka on Thursday September 29, 2016. The Bundle belongs to ENGR 1300 at University of Texas at Arlington taught by Rosie Kellie in Fall 2016. Since its upload, it has received 5 views.


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Date Created: 09/29/16
Fundamental Dimensions and Base Units Chapter 7 Dimensions: Measurable physical idea: it generally consists solely of a word description with no numbers Unit: Describes how much of that dimension exists in a specific situation. I. SI system (Le System International d’Unites): Metric System a. Developed by a French Scientist under King Louis XVI. Finalized by the International scientific community in 1971 b. 7 Fundamental dimensions and base units i. Length Meter (m) L ii. Mass Kilogram (kg) M iii. Time Second (s) T iv. Temperature Kelvin (K) Θ v. Amount of Substance Mole (mol) N vi. Light intensity Candela (cd) J vii. Electric Current Ampere (A) I c. SI Prefix: Using prefixes makes it possible to avoid scientific notation or a long string of zeros. i. Ex. 123000 meters = 123 kilometers ii. Scientific Notation: Uses the power of 10 to move the decimal 1. Ex. 12300000 = 1.23 * 10^7 .000313 + 3.13*10^-4 iii. Engineering Notation: Usually expressed in the form of # # # . # # # *10^M, Where M is an integer multiple of 3, and the number of digits to the left of the decimal is 1,2, or 3 as needed to yield a power of 10 that is a multiple of 3. The number of digits to the right of the decimal is usually between 2 and 4. II. Conversion Procedure a. Write the value and unit to be converted b. Write the conversion formula c. Use stoichiometry (railroad tracks) 1 hr 60 min 60 s 1hr 1 min III. Derived Dimensions and Units a. Derived Dimensions: A dimension expressed by combinations of the seven base dimensions b. Derived Unit: A given name for a derived dimensions i. Ex. Kgm/s^2 = N ii. Officially there are 22 named derived units in the SI System. iii. Radian: The angle at the center of a circle formed by an arc equal in length to the radius, of that circle 1 rad= arc/radius. There are 2π radians in a circle. (Think of the Unit Circle) IV. Equation Laws a. Adding and Subtracting Laws i. Plus Law: You can only add and subtract like parameters ii. Unit Law: You can only add and subtract like units iii. “Add like terms” b. Multiplication and Division Laws i. Per Law: You can multiply or divide different perameters and units V. Conversion Involving Equations a. Equation Procedures i. Convert all parameters into base SI units ii. Perform all calculations iii. Convert final anser to required units.


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