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Post by Charity on Dec 1, 2004 22:20:08 GMT -5
This thread is for posting a SCIENCE FACT A DAY.  Each day a mini topic-tidbit will be posted. |
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Post by Charity on Dec 1, 2004 22:21:18 GMT -5
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Post by Charity on Dec 1, 2004 22:28:42 GMT -5
Brownian motion In 1827 the English botanist Robert Brown noticed that pollen grains suspended in water jiggled about under the lens of the microscope, following a zigzag path like the one pictured below. (Click the mouse button to draw a new path). Even more remarkable was the fact that pollen grains that had been stored for a century moved in the same way. More xanadu.math.utah.edu/java/brownianmotion/1/ |
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Post by Charity on Dec 1, 2004 22:35:38 GMT -5
The Poynting-Robertson Effect A good part of this janitorial work occurs by what scientists call the Poynting-Robertson effect after the scientists who discovered and explained it.1 This is one of the most intriguing solar janitorial clocks indicating a recent creation. It has an imposing name that sounds impressive, but the idea is fairly easy to understand. An Analogy I will use a simple illustration to explain. Assume that a steady rain shower is occurring and that there is no wind. If you sit in your car, the drops appear to come straight down from the sky. In fact, they do come straight down since there is no wind. However, if you start to drive the car, the drops of rain begin to appear as if they are coming down at an angle directly into your front windshield; the faster you drive, the shallower the angle becomes. The same thing holds true if you are standing in the rain with an umbrella. If there is no wind, the drops come straight down and you hold the umbrella directly over your head. However, as you begin to walk you have to tip your umbrella forward in order to keep dry. The faster you walk, the more you tip the umbrella. The crucial point in understanding the Poynting-Robertson effect is that even though the raindrops are coming straight down, they strike an object at an angle as it moves through the rain. Now, although we don't think much about it, a raindrop has weight and substance. It hits your car's windshield with a certain force as you drive along. The force that the rain exerts pushes against the forward movement of the car since the raindrops are coming in at an angle caused by your car's movement. They beat against the front of the car and tend to slow it down. If we could get fine enough measurements, we would find that your car has to burn just a little more gas when driving through the rain, because it takes just a little more power to push the car along the road against the force of the raindrops. More www.creationism.org/ackerman/AckermanYoungWorldChap03.htm |
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Post by Charity on Dec 1, 2004 22:52:07 GMT -5
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Post by Charity on Dec 1, 2004 23:17:27 GMT -5
Guess what this is?  ?  This is called a Polonium Halo Etched within Earth's foundation rocks — the granites — are beautiful microspheres of coloration, halos, produced by the radioactive decay of primordial polonium, which is known to have only a fleeting existence. The following simple analogy will show how these polonium microspheres — or halos — contradict the evolutionary belief that granites formed as hot magma slowly cooled over millions of years. To the contrary, this analogy demonstrates how these halos provide unambiguous evidence of both an almost instantaneous creation of granites and the young age of the earth. A speck of polonium in molten rock can be compared to an Alka-Seltzer dropped into a glass of water. The beginning of effervescence is equated to the moment that polonium atoms began to emit radiactive particles. In molten rock the traces of those radioactive particles would disappear as quickly as the Alka-Seltzer bubbles in water. But if the water were instantly frozen, the bubbles would be preserved. Likewise, polonium halos could have formed only if the rapidly "effervescing" specks of polonium had been instantly encased in solid rock. An exceedingly large number of polonium halos are embedded in granites around the world. Just as frozen Alka-Seltzer bubbles would be clear evidence of the quick-freezing of the water, so are these many polonium halos undeniable evidence that a sea of primordial matter quickly "froze" into solid granite. The occurrence of these polonium halos, then, distinctly implies that our earth was formed in a very short time, in complete harmony with the biblical record of creation. More... www.halos.com/ |
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Post by Charity on Dec 2, 2004 9:05:08 GMT -5
Long-Distance Paper Airplane A Science Lesson, and a Spiritual Lesson The Scientific Method Applied to Paper Airplanes: Just as an ordinary piece of paper, if it is properly prepared and properly motivated, can do incredible things; so can you, if you are properly prepared and properly motivated, do some incredible things for the Lord. Study the Bible and let God prepare you to do some great things for Him! Instructions: Download the Airplane files: Front Side -see link below to dowload plane blueprints Back Side Print out each page (Two sides) Cut the paper in half to 8.5 by 5.5 inches Fold on lines 2 and 3 almost to line 1 (leave a small gap) Fold on lines 4 and 5 almost to line 1 (leaving another small gap) Fold the plane in half on line 1 Staple the plane where it's marked "Staple" (try different places and watch how the plane flies) Fold wings down so they are even with the bottom Bend a jumbo paperclip into a letter "S" as shown Place the small hook of the paperclip between the wings near the back and slide the clip forward so it hooks on the staple Trim about 1 inch off the tail to make it even (and provide longer flights) Place a small piece of tape to hold the paperclip to the plane Loop 5 #64 rubberbands together Have someone hold each end of the rubberband string so the center is loose Hold your plane by the tail, hook the clip under the rubberbands and pull it back and down (a 30-40 degree slope works best) Launch plane outside! Our record is 450 feet! The airplane files require Adobe Acrobat Reader to view and print. To the get latest copy, please visit Adobe's website. Airplane side one: www.hosted-forum.com/index.php?boardid=homeschool&act=Attach&type=post&id=459Airplane side 2: www.hosted-forum.com/index.php?boardid=homeschool&act=Attach&type=post&id=460Or you can download from PDF here drdino.com/QandA/index.jsp?varFolder=Misc&varPage=PaperAirplanes.jsp |
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Post by Charity on Dec 3, 2004 20:51:39 GMT -5
What is the Mohorovicic discontinuity? Moho. The boundary between the crust and the mantle in the earth. This is a depth where seismic waves change velocity and there is also a change in chemical composition. Also termed the Mohorovicic' discontinuity after the Croatian seismologist Andrija Mohorovicic' (1857-1936) who discovered it. The boundary is between 25 and 60 km deep beneath the continents and between 5 and 8 km deep beneath the ocean floor. earthquake.usgs.gov/4kids/eqterms.html |
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Post by Charity on Apr 14, 2005 9:42:11 GMT -5
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