When the rope becomes taut, the force on the jumper is mainly his weight downwards, plus a bit of air resistance up. Therefore his speed is increasing nearly as much as it did when he leapt off the platform. So this is not the greatest acceleration of the jump.
When is the acceleration (rate of speeding up or slowing down) greatest during a bungy jump?
In Queenstown, New Zealand, I jumped off the Kawarau Bridge – the site of the first bungy jump. It was a thrilling experience, preceded by a terrifying, gut-wrenching half hour wait. All in all an awesome adventure, even if the woman fitting my harness didn’t know the first thing about the acceleration of free-falling bodies.
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VentureBoom.com aggregates business news and provides original commentary and informational posts on business-related topics.
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Millennium 3 Solutions provides website, database and report development, as well as computer modeling (simulations), for prediction, visualization and analysis.
According to sources, Osama bin Laden has been killed by U.S. forces. President Obama is expected to make an announcement at 10:30 PM EST May 1, 2011.
It is thought that Osama bin Laden had been hiding in the border region between Pakistan and Afghanistan.
He was killed after a firefight with the US miltary JSOC (Joint Special Operations Command) at a compound outside the Pakistani capitol of Islamabad, after intelligence information revealed his position.
The US waited for DNA results to confirm the identity before going public with the news.
More here:
Usama bin Laden Is Dead, Sources Say
An introduction to alpha, beta, and gamma radiation
There seems to be confusion about what radiation is and where it comes from. Many people believe it is the radiation that comes directly from nuclear power plants that poses a threat to public safety. In fact it is the radioactive atoms, which can escape in the event of an explosion, that pose a safety risk. They can be scattered by the wind over hundreds of kilometres. Then they may be ingested or breathed in. If they release radiation at this point, it is damaging to the body’s molecules and cells because the radiation is delivered directly to tissues.
Many videos on YouTube show water freezing almost instantaneously. This video shows you how to replicate the experiment and it explains how the phenomenon works. Molecular illustrations are courtesy of:
PhET Interactive Simulations
University of Colorado
http://phet.colorado.edu.
Most people recognize that atoms are the fundamental building blocks of all matter around us. An atom itself is composed of protons, neutrons and electrons. The simplest atom is the hydrogen atom because it consists of only one proton and one electron. If a neutron is added to the nucleus, the atom is still hydrogen, just a more massive version. Atoms of the same element (i.e. those with the same number of protons) but different numbers of neutrons are called isotopes.