Tag Archive: physics
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Odds of Direct Asteroid Hit Increased 100x
Plane travel is significantly safer…
The odds of an asteroid 2 miles widing hitting the earth in 2036 have been revised from 45,000:1 to 450:1… by a 13 year old schoolboy who found errors in NASA’s calculations.
NASA had previously estimated the chances at only 1 in 45,000 but told its sister organisation, the European Space Agency (ESA), that the young whizzkid had got it right. The schoolboy took into consideration the risk of Apophis running into one or more of the 40,000 satellites orbiting Earth during its path close to the planet on April 13 2029.
If there were a direct hit in, say, the Atlantic Ocean, the resultin Tsunami would destroy “both coastlines and inland areas, whilst creating a thick cloud of dust that would darken the skies indefinitely.”
Clearly this is not a risk if we all get swept into a black hole next month when the Center for Nuclear Research turns on the $8bn Large Hadron Collider.
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Ice in the Desert: A Fridge without Electricity
New idea used very old technology
According to the Bible, you can make ice in the desert.
The process is not an act of faith but actually one of physics . It is the result of heat transfer that takes place during evaporation.
if one dug a shallow hole, lined the cavity with straw and placed a ceramic pan with a thin layer of water into the straw-lined nest, then there would be minimum conduction, little or no convection, and radiant heat transfer to outer space would control. Since outer space has an equivalent temperature of minus 400 degrees F, and radiation is governed by the difference between the absolute temperatures to the fourth power, you can make ice in the desert. - Jerry Roach
This principial has now been used to invent a fridge which doesn’t use electricity.
Here’s how it works. You take a smaller pot and put it inside a larger pot. Fill the space in between them with wet sand, and cover the top with a wet cloth. When the water evaporates, it pulls the heat out with it, making the inside cold. It’s a natural, cheap, easy-to-make refrigerator.
The inventor, Mohammed Bah Abba, comes from northern Nigeria, where over 90% of the villages have no electricity.
The invention won him a $10,000 Rolex award for Enterprise.
