Double slit wave interference

Here is a dandy link to a recreation of Young's original Double slit wave interference of light experiment.   Why do these people have accents?

Environmental Science Sub Irrigated Planter Instructions

Here is  a link to instructions of how to build a 2 liter sub irrigated planter

Numbered Heads Heat and Thermodynmics test review

Numbered Heads Instructions

1. Form into the designated groups

2. Take out one full sheet of paper per group and list the name of the group at the top. Then list the names of the group members and place numbers next to each name (1, 2, 3…..If four members then write 4 also). It doesn’t matter who gets what number.

3. Hand the paper to the instructor. It will be used for assessment and graded.

4. Begin reviewing/ learning the listed concepts. Make up sample questions related to the concept. Try and figure out what question the teacher will ask. Time is limited; so don’t waste it!

5. Once you understand the concepts make sure each group members also understand by assessing them. Do not ask yes or no assessment questions.

Good Assessment. “Sam, could you show me how to do number three on the list?”

Poor Assessment. “Do you guys all know it?”

6. When the instructor calls a number randomly (ex. = 3) the three will go to a designated area alone and respond to a similar question. Make sure they have something to write with and a calculator. After they leave begin studying the next set of concepts for the next round.

7. After a short amount of time the person will then return to the group and their answer will be graded by the teacher and given to the entire group as a communal score.

8. The returning group member may be called again so they should receive extra instruction to help get caught up.

9. The scores are added at the end to determine winners. The top three groups receive extra points on the test.

Here are the concepts covered on the test:

1.  Converting Temperatures  (F to C,  C to K  or backwards)

2.  Internal energy convert ions with other forms of energy like PE and KE

3.  Calorimetry with hot metal and cold water, finding and unknown like specific heat of the metal, or the final temperature of the mix

4.  All heat formulas and all Thermodynamics formulas

5.  Heat required to melt or vaporize  = mL     Know the difference between L vaporization and L fusion

6.  Heat required to raise temperature in a phase like solid, liquid or water = MC delta T

7.  Work required to move a piston by a gas,  also calculating pressure given work and the radius of the piston or area and displacement

8.  Finding Q cold given efficiency and work  or finding efficiency  given work and Q hot.

9.  Standards for +/-  work and heat

10.  Understand entropy and describe situations of increasing or decreasing entropy.

Wave interference and boundary behavior

Here is a link to a tutorial on wave boundary behavior.  Read the content and watch  the video with the following in mind:

When do waves invert?

What happens to speed of the wave in different medias for reflected, transmitted and incident waves?

Biochar Sales Assignment

Biochar Sales Assignment.  Due date Wednesday  30 points

Design a one page 8.5”  X 11” advertisement for selling biochar online.   The advertisement should communicate your understanding of how biochar works  as well as your understanding of the competitive nature of the market.

The advertisement should include:

1.     Interesting name for your product  and Buy It Now Price

2.     Colorful original graphic.  You may not use graphics that you did not create

3.     Description of product to include:

weight and/ or  volume

size of char particles

picture of char particles

how char was made  (ex high temp pyrolysis of hard wood pellets)

Country of product origin of product

4.     Instructions for using the char  (example—how to inoculate with compost, how to charge with either compost tea or other high nitrogen sources, and how to mix with soil, either in pots or in ground

5.      Explain method of biochar action ---ie symbiosis with mycorrhiza, plants and nitrogen fixing bacteria, as well as the fact that the biochar is a general nutrient sponge for NPK, so less fertilizer runs off

6.     Print out the one page label with the graphic.   This does not have to include all of the information   but should at least include the essentials.      The total information can be more than one page if required.  

Fluids Test Overview for Monday

Here is an outline of what will be on Monday's Fluids Test

1.  Be able to predict and explain why floating objects would float higher in a dense fluid like alt water than in a less dense fluid like fresh water.  Think forces.

2.  Calculate a buoyant force given the weight in air and in water  and then be able to calculate the density of the object.  Understand that if it has an apparent weight in water it has sunk.

3.    Calculate the buoyant force in water of a floating object given only its mass in air

4.  Calculate buoyant force of a sunken in water cube given dimensions

5.  Find the density of a rock in kg/ cubic meter given mass and volume in cubic centimeters

6.  Find volume of a helium balloon needed to lift a given payload when mass of balloon skin, payload, density of air and helium and air are given .  This involves algebra solving for volume

7.  Find pressure on a chair leg given mass and contact radius  of one leg

8.  Calculate total or absolute pressure at a given depth in water.  From their calculate gauge pressure.

9.  Solve for velocity of fluid in a pipe given diameter at both ends and speed at one end

10  Explain lift over an aerodynamic structure like a sail or a wing in terms of fluid velocity, pressure and force.

Study Guide for Momentum and Impulse test Chap 6

Here is a list of topics for the Chap 6 Test

1.  calculate linear momentum given m and v  and understand that negative veloccity defines opposite direction  P = mv

2.   Understand the Impulse momentum equation   M delta V = f delta T  Impulse is f de;ta t measured in Nxsec  and change in momentum is measured in Kg X m / sec  Be able to calculate any one quantity given the three

3.  Calculate stopping distance  as in Sample problem C pg 202 text  You must remember the four equations of motion

4.  Know the equations  for conservation of Momentum and kinetic energy

5.  Know the difference between an elastic and inelastic collision and what is conserved in each type


6.  Solve for a final velocity in an inelastic collision  (practice E pg 214)

7.  Solve for a final velocity in an elastic collision  (sample G pg 218)

8.  Be able to calculate the change in KE for a collision and interpret results.  Ex if delta KE = O, then KE was conserved and this was perfectly elastic.  If KE is not zero, energy was lost as nonmechanical energy like heat, sound.