Destruction by Earth, Water, ... and ?
... Fire 
Often the concepts of heat and temperature are thought to be the same, but they are not.
Perhaps the reason the two are usually and incorrectly thought to be the same is because as human beings on Earth our everyday experience leads us to notice that when you add heat to something, say like putting a pot of water on the stove, then the temperature of that something goes up. More heat, more temperature - they must be the same, right? Turns out, though, this is not true.
Kinetic energy is a general term describing the energyassociated with the motion of objects (large or small objects).
You can calculate the kinetic energy of an object of
mass m with a velocity (speed) v from the formula
K.E. = 1/2 mv^2.
Thermal energy refers to the kinetic energy of the
microscopic particles (atoms and molecules) that
make up all samples of matter - i.e. all objects.
When you add heat to an object, you increase
the temperature of the object (usually) and that
heat increases the kinetic energy of the molecules
that comprise that object.
In fact, temperature is a measure of the average
kinetic energy of the microscopic particles that
make up an object.
exothermic ? Endothermic?
How does Heat Transfer?Transfer of HeatView more presentations from meenng
Balancing chemical equations isn't difficult, once you know the way to do it. Start by finding out how many atoms of each type are on each side of the equation. Some teachers recommend making a little table listing the numbers of each atom for the left hand side and for the right hand side.Example 1Unbalanced Equation:- C3H8 + O2 ---> H2O + CO2
There are three carbons on the left, but only one on the right.
There are eight hydrogens on the left but only two on the right.
There are two oxygens on the left but three on the right.
Next, look for an element which is in only one chemical on the left and in only one on the right of the equation. (But it is usually a good idea to leave hydrogen and oxygen until you've done the others first.)
To balance that element, multiply the chemical species on the side which doesn't have enough atoms of that type by the number required to bring it up to the same as the other side. The number is called the coefficient.
BUT
If you have to multiply by, say, 2 1/2, do so, THEN multiply EVERYTHING on each side of the equation by two to get rid of the half.
We don't like having halves in equations, as you can't get half a molecule.
Now look for the next element or species that is not balanced and do the same thing.
Repeat until you are forced to balance the hydrogen and oxygens.
Thanks to The Wright Stuff and Sky-Web, http://www.sky-web.net/science/balancing_chemical_equations.htm
Absolutely not! In fact, it would be foolish to spend so much time and money to ride a selection of roller coasters if it were for reasons of speed. It is more than likely that most of us sustain higher speeds on our ride along the interstate highway on the way to the amusement park than we do once we enter the park. The thrill of roller coasters is not due to their speed, but rather due to their accelerations and to the feelings of weightlessness and weightiness that they Roller coasters thrill us because of their ability to accelerate us downward one moment and upwards the next; leftwards one momen
t and rightwards the next. Roller coasters are about acceleration; that's what makes them thrilling. The centripetal acceleration experienced by riders within the circular-shaped sections of a roller coaster track. These sections include the clothoid loops , the sharp 180-degree banked turns, and the small dips and hills found along otherwise straight sections of the track.produce.
How do physics laws affect amusement park ride design? In this exhibit, you'll have a chance to find out by designing your own roller coaster. Plan it carefully--it has to pass a safety inspection.You can also experiment with bumper car collisions.
Check the physics glossary to find out more about the terms used in this exhibit. Just click on
Ready to roll? Go on to the first ride: The Roller Coaster.
Carousels are not considered "thrill machines" by any stretch of the imagination. Still, carousels are as reliant on the laws of motion as their more exciting cousins, the roller coasters. It's theoretically possible that, allowed to spin out of control, a carousel could gain enough speed so that the riders would be thrown off. Thankfully, runaway carousels are not the least bit common.
 | Flight, A Very Natural Occurrence |
| | Gliding Flight |
| | True Flight |
| | Principles of Flight |
| | What is Aeronautics? |
| | How Fluids Move |
| | How Liquids Behave |
| | How Air Moves - Aerodynamics |
| | Measurement |
| | Properties |
| | How Air Moves Over Objects |
Periodic Table.
