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 [http://en.wikibooks.org/wiki/Modern_Physics/Constants_of_Nature Physical Constants]<br>
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 ;E - is the symbol for energy.
-:Energy is a unit of work in MKS system it is <math>Kg \cdot M^2/sec^2</math> which is known as a Watt.
+:Energy is a unit of work in MKS system it is <math>Kg \cdot M^2/sec^2</math> which is known as a Watt. In the CGS system it is a <math>g \cdot m^2/sec^2</math> which is known as an erg. Energy can take the form of heat, and is measured in calories or Kilocalories when talking about heat. Calories are measured in a calorimeter by measuring the change in temperature of water by adding heat into the system. One calorie of heat raises one gram of water one degree centigrade. To show how mechanical energy or work is related to heat energy, paddles are turned in the calorimeter and the temperature change is measured.
 ;m- is the rest mass of a particle.
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 ;c- is the speed of light.
-:C stands for celeritas which is Latin for swiftness and is used to represent the speed of light.
+:C stands for celeritas which is Latin for swiftness and is used to represent the speed of light. 299,792,458 Meters/second or 186,282.397Miles/second
-;2- The 2 on the right of the c represents the action known as squaring a number.
+;2- The 2 on the right of the c represents the action known as squaring a number. We square a number by multiplying it by itself. In this equation we are squaring a very large number which yields a very very large number :<math> 299792458m/sec \cdot 299792458m/sec = 8.98755179\times10^{16}m/sec^2</math>
 What this equation indicates, is that mass and energy are interchangeable. Mass can become energy and energy can turn into mass. Before Einstein, there were two laws of physics
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 ;Method
-:Provide as little guidance as possible. Let the spirit of learning guide.
+:Provide as little guidance as possible. Let the spirit of learning guide. Competition between two or more groups can be prompted by seeing which team can get the balloon to fly to a specific target.  Once a team figures out the way to guide the balloon, then you can have races between the various teams.
 ;Questions
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 ;Materials
 :Plastic beverage bottles
-:water
+:Water
 ;Method
-:have the class drop plastic beverage bottles and judge which hits first. Have one half full of water and the other completely full of water. Make sure the lid is screwed on tightly.
+:Have the class drop plastic beverage bottles and judge which hits first. Have one half full of water and the other completely full of water. Make sure the lid is screwed on tightly.
 ;Questions
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 [http://en.wikipedia.org/wiki/Absolute_zero Absolute Zero]<br>
 [http://en.wikibooks.org/wiki/Modern_Physics/Constants_of_Nature Physical Constants]<br>
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AY Honors/Physics/Answer Key/en - Revision history

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