The Montauk Monster
It looks like Toka from TEENAGE MUTANT NINJA TURTLES
Shinobi!
Wednesday, April 20, 2011
NEW SEA CREATURE DISCOVERED IN JAPAN
UFO New sea creature discovered in Japan
ALL I CAN SAW IS O MY GOODNESS
Sunday, April 3, 2011
ONE OF MY BEST GIFTS EVER: DC 75 dc comics year by year a visual chronicle
 |
The front cover is awesome! |
 |
I love this picture of Batman !! |
 |
I am going to get a big poster for my room! |
* This is a worthwhile 75th anniversary collector’s item and a great way to encapsulate DC Comics’ rich history.By all means, this belongs on your bookshelf. It Is ON Mines!!! Here are some of my favorit art work from the book. Green Lantern ReBirth # 6
The End of the World WatchMen #12
Crisis On Infinite Earths
ROCKETS VS JETS
Sir Isaac Newton formulated the following laws in his book Philosophiae Naturalis Principia Mathematica (The Mathematical Principles of Natural Philosophy).
First Law
Any object in a state of rest or of uniform linear motion will remain in such a state unless acted upon by an unbalanced external force. Basically this means that the velocity (speed and direction) of the object will remain unchanged if no such force acts on it. (If an object has zero velocity it is at rest.)
Any object in a state of rest or of uniform linear motion will remain in such a state unless acted upon by an unbalanced external force. Basically this means that the velocity (speed and direction) of the object will remain unchanged if no such force acts on it. (If an object has zero velocity it is at rest.)
Second Law
An unbalanced force acting on a object produces an acceleration in the direction of the force, directly proportional to the force, and inversely proportional to the mass of the object. In other words, if the force is vector F, the mass is scalar m, and the acceleration is the vector a, then F = ma.
An unbalanced force acting on a object produces an acceleration in the direction of the force, directly proportional to the force, and inversely proportional to the mass of the object. In other words, if the force is vector F, the mass is scalar m, and the acceleration is the vector a, then F = ma.
Third Law
For every action (or force) there is a reaction (or opposing force) of equal strength but opposite direction.
For every action (or force) there is a reaction (or opposing force) of equal strength but opposite direction.
Jets
A jet engine requires a medium in which to work. In the case of an aeroplane, the medium is the air. In the case of a squid, the medium is the water.
The engine works by drawing in the medium at the front, compressing it and accelerating it, then forcing it out at the back at a much higher speed. A squid does this by squeezing with its muscles, but jet engines require fuel, combustion and complex arrangements of turbines.
The acceleration of the air or water in one direction causes an equal and opposite reaction, namely an acceleration of the engine or the squid in the opposite direction.
Going back to the swing analogy, the air in front of the jet engine is simply a continuous supply of jackets to throw out at the back. A jet engine therefore absolutely requires the presence of a medium which it can accelerate in order to work.
A rocket is in principle simpler than a jet engine, which may explain why rockets were invented so much earlier.
Basically, a rocket burns fuel and throws the combustion products out behind it. This produces the familiar 'equal and opposite reaction' and accelerates the rocket forward until the fuel runs out. And that's it.
In the swing analogy, a rocket engine has all the jackets it needs on the swing already - it needs no external supply. This on-board supply is sometimes called the reaction mass. Since a rocket can carry as much reaction mass as it needs, it can work perfectly well in the vacuum of space.
A jet uses the combustion of a small quantity of fuel to accelerate a large quantity of air. To get the same reaction, a rocket must combust a huge quantity of fuel, which also needs to be extremely high in energy. Petroleum products are fine for cars, and even jets, but rockets such as the space shuttle burn exotic mixtures mainly composed of hydrogen and oxygen. Because of these quantities, rockets are terribly inefficient compared to jets, which explains why Concorde has no competition from rocket airliners.
On the other hand, a rocket can generate huge accelerations which would be impossible to achieve with jets (which is why they're used in things like ejector seats), and they can work in the vacuum of space, which is obviously why they're used on spacecraft. They're also in principle much simpler to build and maintain, with fewer moving parts. This obviously accounts for the cheapness of fireworks, which are rockets, not jets.
no competition from rocket airliners.
On the other hand, a rocket can generate huge accelerations which would be impossible to achieve with jets (which is why they're used in things like ejector seats), and they can work in the vacuum of space, which is obviously why they're used on spacecraft. They're also in principle much simpler to build and maintain, with fewer moving parts. This obviously accounts for the cheapness of fireworks, which are rockets, not jets.
hasIn order to understand how an engine works, we first need to understand the process of combustion. Combustion is defined as the burning, or oxidation, of matter to produce energy. Two substances are necessary for combustion to occur--a fuel and an oxidizer. A fuel can be anything from the wood, coal, or natural gas used to produce heat in a furnace to gasoline or hydrogen used in an internal combustion engine. An oxidizer, as its name implies, is a substance that contains oxygen.
The purpose of both the jet engine and the rocket engine is to burst in to flames a mixture of fuel and oxidizer. This combustion process generates a high-pressure exhaust that creates thrust to push a vehicle forward. The fundamental difference between the two types of engines, however, is where the oxidizer comes from.
A jet engine obtains its oxidizer from the external atmosphere, as illustrated in the diagram below. Air enters the engine through an inlet and is then slowed down and compressed by a series of compressor blades. The compressed air is then mixed with fuel, typically a petroleum-based liquid similar to kerosene, and burned. The high-pressure gas is exhausted through a nozzle to generate thrust.
engine differs from a jet engine primarily in one key way. Whereas the jet pulls in oxidizer from the atmosphere, a rocket carries its own supply of oxygen aboard the vehicle. An example shown below is the liquid rocket engine. This class of rocket carries a liquid fuel and a liquid oxidizer in two separate tanks. The two liquids are pumped into a combustion chamber at some rate, called the mass flow rate, where they are mixed and burned. Just as in the jet engine described earlier, this combustion process generates a high-pressure gas that is exhausted through a nozzle to generate thrust.
engine. This class of rocket carries a liquid fuel and a liquid oxidizer in two separate tanks. The two liquids are pumped into a combustion chamber at some rate, called the mass flow rate, where they are mixed and burned. Just as in the jet engine described earlier, this combustion process generates a high-pressure gas that is exhausted through a nozzle to generate thrust. 
There are many different combination of liquids that can be combusted in liquid rockets.
One of the more common combination's, however, is liquid hydrogen as the fuel and liquid oxygen as the oxidizer. Other common fuels include kerosene and hydrazine while a frequently used oxidizer is nitrogen tetroxide. Liquid rockets
are most commonly used on large vehicles that launch payloads into space, like the American Delta and Titan, Russian Soyuz and Proton, and European Ariane rockets.
One of the more common combination's, however, is liquid hydrogen as the fuel and liquid oxygen as the oxidizer. Other common fuels include kerosene and hydrazine while a frequently used oxidizer is nitrogen tetroxide. Liquid rockets are most commonly used on large vehicles that launch payloads into space, like the American Delta and Titan, Russian Soyuz and Proton, and European Ariane rockets. Another major form of the rocket is the solid rocket motor, like that illustrated below. A solid rocket also carries both the fuel and oxidizer aboard the vehicle. The difference between a solid rocket and a liquid rocket, however, is that the fuel and oxidizer are mixed together and cast into a solid mass. This mixture is inert and does not burn under normal conditions. When exposed to a heat source, like an igniter, however, a flame travels along the surface of the solid and explodes the mixed fuel and oxidizer. Once started, this reaction cannot be stopped, and the flame front will continue combustion the solid fuel until none remains.
Saturday, April 2, 2011
SHINOBI THE BUG CATCHER
Hi My Name is Shinobi. I am 8 years old and this is my site for me to share all my cool stories.
This is a picture of me with my favorite spider and dragon fly!
Subscribe to:
Posts (Atom)