Pilot, Wright Field P project officer George Price, saves prototype with deft belly-landing, damage mostly limited to the propeller.
Stop reading now, and ponder the table of energies.
Concentrate on the last column. Look for the numbers that are surprising. How many can you find? My answers are below. I think all of the following are surprises: Even most physics majors will be surprised.
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These surprises and some other features of the table are worthy of much further discussion. They will play an important role in our energy future. When TNT is exploded, the forces push the atoms apart at very high speeds. One of the biggest surprises in the energy table is that chocolate chip Airplane crashes essay CCCs have eight times the energy as the same weight of TNT.
How can that be true? That includes most physics majors. What makes TNT so useful for destructive purposes is that it can release its energy transfer its energy into heat very, very quickly. The heat is so great that the TNT becomes a gas that expands so suddenly that it pushes and shatters surrounding objects.
A typical time for 1 gram of TNT to release all of its energy is about one millionth of a second.
Such a sudden release of energy can break strong material. Power is the rate of energy release. Even though chocolate chip cookies contain more energy than a similar weight of TNT, the energy is normally released more slowly, through a series of chemical processes that we call metabolism.
This requires several chemical changes that occur during digestion, such as the mixing of food with acid in the stomach and with enzymes in the intestines.
Finally, the digested food reacts with oxygen taken in by the lungs and stored in red blood cells.
In contrast, TNT contains all the molecules it needs to explode; it needs no mixing, and as soon as part of it starts to explode, that triggers the rest. If you want to destroy a building, you can do it with TNT.
Or you could hire a group of teenagers, give them sledgehammers, and feed them cookies. Since the energy in chocolate chip cookies exceeds that in an equal weight of TNT, each gram of chocolate chip cookies will ultimately do more destruction than would each gram of TNT.
Note that we have cheated a little bit. If we were to include the weight of the air, the energy per gram would be lower, about 2. The surprisingly high energy of gasoline As the energy table shows, gasoline contains significantly more energy per gram than cookies, butter, alcohol or coal.
This fact will be important when we consider alternatives to gasoline for automobiles. Gasoline releases its energy turns it into heat by combining with oxygen, so it must be well mixed with air to explode.
In an automobile, this is done by a special device known as a fuel injector; older cars use something called a carburetor. The explosion takes place in a cylindrical cavity known, appropriately, as the cylinder. The energy released from the explosion pushes a piston down the axis of the cylinder, and that is what drives the wheels of the car.
The muffler on a car has the job of making sure that the sound from the explosion is muffled, and not too bothersome. Some people like to remove the muffler--especially some motorcyclists--so that the full explosion is heard; this can give the illusion of much greater power.
Removing the muffler also lowers the pressure just outside the engine, so that the power to the wheels is actually increased, although not by very much. The high energy per gram in gasoline is the fundamental physics reason why it is so popular. Another reason is that when it burns, all the residues are gas mostly carbon dioxide and water vapor so there is no residue to remove.
In contrast, for example, most coal leaves a residue of ash.The World Trade Center crashes killed 2,, the vast majority of fatalities being occupants of the World Trade Center towers or emergency personnel responding to the disaster.
This was, at the time, the deadliest terrorist attack involving an airplane. On August 19, , Bureau of Aircraft Accidents Archives (B3A). Editors Note: Although the following article does not deal with ejection seats or egress systems specifically, John Paul Stapp's contribution to the field is a large part of .
Airline pilots were once the heroes of the skies.
Today, in the quest for safety, airplanes are meant to largely fly themselves. Which is why the crash of Air France Flight , which killed. 1. Energy and Power. and the physics of explosions. Comet Shoemaker-Levy crashes into Jupiter . At the end of the Cretaceous period, the golden age of dinosaurs, an asteroid or comet about 10 miles in diameter headed directly towards the Earth with a velocity of about 20 miles per second, over ten times faster than our speediest ph-vs.com such large objects may have come close to the.
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