DAVID POGUE: The military made only one uranium bomb, because separating rare U-235 from the more common U-238, which doesn't work in fission reactions, is a very difficult process. Dude, you just caught a shark with your bare hands! Then, flip the shark upside down, which induces a trance state called "tonic immobility." Once the shark is calm, we test its reaction to a piece of ordinary, non-magnetic lead
Why does wet cold air feel so much colder than dry cold air? - Physics - Science Forums
Wet air is denser, and more molecules come in contact with your skin than less dense, non-humid air, hence the perception of temperature is more intense.Moist air is less dense that dry air. Imersed in wet air (a better conductor) your surface attains a temperature nearer that of its surroundings than it would surrounded by dry air (a poorer conductor)
NARRATOR: The magnetic field from the track induces a current in the superconducting puck, which, in turn, creates an opposite magnetic field that makes the puck levitate. They can obtain, at that store, foods that are from almost anywhere in the world, that have been transported and kept cool, and then they can keep them in their own home
We don't want the scaffold melting in mid flight! Step 3: Install Platform and ScaffoldWith the candles facing inwards towards the bag opening, tape each corner of the "X" to the lip of the trash bag. The important thing, according to the author, is to judge how many fire starter bars will be required to make the balloon rise without melting its plastic body
Additionally, hydrogen is used for a variety of purposes and within a variety of products for everything ranging from fuel to disinfecting to the creation of a variety of useful products found around the home. Scientists are working to find a way to use hydrogen to create thermonuclear energy, which would be a much more efficient form of energy than currently used forms
interFIRE, A site dedicated to improving fire investigation worldwide.
In oxygen-enriched atmospheres, such as in areas where medical oxygen is in use or in high-pressure diving or medical chambers, combustion is greatly accelerated. Even though most of a liquid may be slightly below its flash point, an ignition source can create a locally heated area sufficient to result in ignition
Learn more Where Loon has been Project Loon began in June 2013 with an experimental pilot in New Zealand, where a small group of Project Loon pioneers tested Loon technology. Project Loon is a network of balloons traveling on the edge of space, designed to connect people in rural and remote areas, help fill coverage gaps, and bring people back online after disasters
Q: Where does the term "Blimp" come from? A: The popular story is that during World War II, a military general visited one of the many airship stations operated by the U.S. Q: Why do Airships Fly? A: Why airships fly is explained by the Principle of Archimedes: "Bodies submerged into a fluid receive from it a lifting force which is equal to the mass of the displaced fluid." (This is the same principle that explains why boats float on water.) The airship is filled with a lifting gas (Hydrogen, Helium, hot air or natural gas)
Stars on Set Photos - ABC News
26, 2014.Rex USALea Michele and Cris Colfer Hold Vigil at 'Glee'Lea Michele, Chris Colfer, Chord Overstreet and Darren Criss on the set of 'Glee' in Los Angeles, Feb. 19, 2013, in Bulgaria.Splash NewsWhy James Franco Is Flying HighJamie Dornan arrives on the set of 'Fifty Shades of Grey' with co-star Dakota Johnson in Vancouver, Dec
Excellence Center of Science and Mathematics Education at King Saud University King Saud University seeks to become a leader in educational and technological innovation, scientific discovery and creativity through fostering an atmosphere of intellectual inspiration and partnership for the prosperity of society. Sample Learning Goals Determine what causes the the balloon, rigid sphere, and helium balloon to rise up or fall down in the box.Predict how changing a variable among P, V, T, and number influences the motion of the balloons
After a successful free flight in England was made by Vincent Lunardi in September of 1784, a new goal was set by a pair of intrepid aeronauts - Jean-Pierre Blanchard and his companion, Dr. It is reported to have risen to a height of about 1,000 feet and traveled about 3,000 ft horizontally before it fell to the ground as the air in the envelope cooled
For more detailed information on design and construction -- Stay tuned! NOTE: For any type of experimental fire balloon, it is not a good idea to rely too much on an outside heat source. This provides "negative draft," which helps to reduce the de-stabilizing effects of "billowing." "H-Frames" are made by tying three balsa wood sticks together with string
Scientists do not fill the balloon to capacity for strategic reasons: as a balloon rises into the atmosphere, the pressure around the balloon decreases. That person should mail the radiosonde back to a reconditioning center where scientists read the data, repair any damages and reuse the radiosonde for a future flight
home experiment - How explosive is hydrogen gas? - Chemistry Stack Exchange
Also, because hydrogen is so much lighter than air, it tends to accumulate under the ceiling, so even if there is enough air in the room that an ideal mixture would not be explosive, chances are that there is an explosive layer of gas. (Same with gasoline or, practially more relevant: solvent from glue for parquet floor tiles) The safety relevant points are: the limits of explosion and flammability are, even in air, extremely wide
Helium should not be confused with hydrogen, which is an inflammable gas that was often used in balloons and airships until the explosion of the airship Hindenburg in 1937. How can they refine their designs for better performance, or alter the designs for different results? Have the students research the part that balloons played in the history of flight
How to Become a Hot Air Balloon Pilot - Balloon Flight Training
You will be expected to assist in handling equipment weighing several hundred pounds, be able to withstand hard landings (yours not mine), and working outdoors in temperature extremes. We are pay as you go, so there is no requirement to put down a large sum at once, however; if you have to take breaks in training, for any reason, it will ultimately cost you more
Buoyancy: helium vs hydrogen balloons - Physics Stack Exchange
Buoyant force is simply equal to the weight of the amount of surrounding fluid that would occupy the space filled by the balloon, if the balloon were not there. That means the buoyant force on them, which is just enough to hold up air, is more than enough to hold up the balloons, and they have to be tethered down
Wikimedia Commons In 1794, during the Battle of Fleurus in the French Revolution, a balloon called Entreprenant was flown for aerial observation to suss out enemy positions during combat. In 1808, two Frenchmen found themselves in a love-triangle with Mademoiselle Tirevit, a celebrated opera dancer, and took to the skies above Paris for a duel
Technology and Science News - ABC News
The WebRole needs to periodicly look for new versions of the IDynamicWebRole implementation and when there is a new version, download it, start new AppDomain and create a remote instance of the IDynamicWebRole implementation. Always trying to optimize, I thought if ways to get around all this redeploying and came up with the idea of making it possible to change the WebRole behavior at run time
What is Hydrogen? (with pictures)
by email wiseGEEK Slideshows You won't believe these 10 facts about people Adorable animal families that will make you "aww" Top 10 facts about the world Top 10 amazing movie makeup transformations Top 10 unbelievable historical concurrencies 10 most extreme places on Earth These 10 animal facts will amaze you These 10 facts about space will blow your mind Can you see through these real-life optical illusions? 10 hilariously insightful foreign words Hydrogen is a highly flammable chemical element that occurs in great abundance throughout the universe. It was originally used as a lifting agent in balloons and zeppelins because it was so light, but the explosive nature of the gas led to the proposal of helium as a more stable and safe replacement
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