4-17-09

Today, Friday the Seventeenth we will be doing the following:

-Collect Preliminary Designs -Review Quiz -Discuss factors for the Speed of Sound -Wave Speed Equation

Homework for the Weekend:

-Week two roller coaster project due April 24th. (Next Friday) -Wave Problems due Monday

The answers for our wave problems are: 1. 10 s 2. 5 m/s 3. a. .288 m/s b. .208 s 4. a. 2.44 m/s b. 2.94 m 5. a. 1500 m/s b. .000001 s 6. a. 471 Hz b. 235 waves c. 165 m

At The beginning of class Mr. Manning handed back our Unit Nine Reading Guide worth twenty points and our Unit 10 quiz worth nine points. Following that, we handed in our ride designs and description. Next, we went over the quiz that we took yesterday. If you missed the quiz, don't forget to make it up. This quiz was about transverse and longitudinal waves. After going over our quizzes, As a class we began to go over the factors that could disturb a sound wave and examples of each.

Factors: Examples: 1. Medium 1. water, oil, air 2. Density 2. water 3. Temperature 3. 331 m/s @ 0 decrees Celsius 4. Humidity 4. High Humidity...Low Speed 5. Altitude 5. Denver/LAX 6. Pressure

After discussing our factors, we moved learning the equations for wave speed.

velocity=displacement/time velocity=frequency x landa

Once we were taught the equations, Mr. Manning gave us a problem to try to figure out.

Next, Mr. Manning gave us our homework worksheet to work on for Monday .