eet 109 math october 5,2015 week 2 day 1. united states silver dollars 1794 – 1803 up to $2,000...
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EET 109 MathOctober 5,2015
Week 2 Day 1
United States Silver Dollars
1794 – 1803 Up to $2,000 used $50,000 new
1836 – 1839 Up to $1,000 used $5,000 new
Carat versus Karat
carat: a unit for measuring the weight of jewels (such as diamonds) that is equal to 200 milligrams.
karatA unit of weight equal to 200 mg (3.1 grains). Also used as a measure of gold purity (per 24 parts gold alloy).
Chapter 1
Fundamental Concepts
Home work Week 1
Appendix B4 question 20.Paint needed to paint a house. Should be measured in liters but once
applied the answer could be meters squared.
Turn in completed home work not partial.
Staple your work together and in order.
Graded and Recorded
10/10 8/10 Score
Scored and recorded.
ENGINEERING NOTATION
The letters replace the math.
50mA is 50 milliamps.
NOT 50 x mA
The m replaces x
At most 3 numbers one letter one unit of measurement.
Chapter 1
Fundamental Concepts
1.11 FORMULAS page 40
A formula is an equation, usually expressed in letters, that shows the
relationship between quantities.The letter being something we are interested in.
$ I got = $ I earned - $ I spent.
1.11 FORMULAS page 42
Solving a formula means to isolate a given letter on one side of the equal sign.
We solve formulas using the same principles used solving equations.
1.12 SUBSTITUTION OF DATA INTO FORMULAS Page 45
#1 is saying the same as stated earlier:Solving a formula means to isolate a given letter on one side of the equal sign.
1.12 SUBSTITUTION OF DATA INTO FORMULAS Page 46
1.11 Page 43
Ohm’s Law
Three units three variations.Multiplication and division.
Exercises 1.12 page 48 number 13
Exercises 1.12 page 48 number 13
75.0 is 2 keystrokes on a calculator that do nothing but create an opportunity to make a data entry error.
75Ω is just a unit and is not needed for calculations.
Hz is just a unit and is not needed for calculations.
In class exercise.
Chapter 3
Right-Triangle Trigonometry
Jump to Chapter 3Objectives Understand the degree/minute/second and radian measures of an angle. Know the Pythagorean theorem. Know the ratio definitions of the trigonometric functions. Know the values of the trigonometric functions for key angles. Use a calculator to evaluate trigonometric functions. Solve right triangles.
You have to know the triangle first.
A right triangle has one right angle, two acute angles, a hypotenuse.
A right angle is an angle of 90°An acute angle is an angle whose measure is less than 90°.
Page 115
How much is the rotation; how large is the angle?Angles can be measured using any of three units of measure:
revolutions degrees radians
Revolutions RPM
The side originates at the center, it is a line.
This will correspond later to ordered pairs and
Degrees 360 degrees = 1 revolution
The one radian is just under 57.3 degrees.
Where are the triangle?
A, B, C are angles.a, b, c are sides.
The Pythagorean theorem gives the relationship
among the sides of a right triangle.
Pythagorean Theorem page 118
Page 119
The 6 trigonometric ratios express the relationship between and acute angle of a right triangle and the length of 2 sides.
Page 133Note: While all six trigonometric rations may be used to solve a right triangle, we will usually choose sine, cosine, and tangent because these buttons appear on calculators.
The Soup is Cold o a oh ah
Tan = Op/AdjSin = Op/HypCos = Adj/Hyp
SOH CAH TOA
Sin = Op/HypCos = Adj/HypTan = Op/Adj
The side opposite the angle.
The side opposite the angle.
For Trigonometry you will need a calculator.
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