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The S stanley tumblers audi physicists couldnt use pure ice balls, like the ones in your cocktail, since theyd just float. Instead, the team created shells of dyed ice around steel, tungsten carbide, and steel/aluminum balls, giving each a core of different density. Then they dropped the balls stanley puodelis into a nearly eight-foot 2.4 meters tank of water, recording how quickly each ball fell through the liquid with high-speed video cameras. As the balls fell, they left an inky red t bidon stanley rail in their wake as the ice layer began to melt, the better to visualize the drag effect. The upshot: ice-coated balls with denser cores fell faster, with less drag and a narrower wake, than ice balls with less dense cores. The Saudi team said this has shed light on whats known as the drag crisis : a transition point where an object moving through a fluid air or water reaches a threshold speed that results in less turbulence in its wake, and hence less drag. Adding dimples to golf balls, for instance reduces drag. Its also known that an icy surface can have a lubricating effect: a hockey puck slides smoothly along the ice because that surface has a thin layer of water on top, the result of melting. The Saudi experiment showed a similar connection between melting and this drag crisis threshold. The physicists hope their results could be useful for modeling the drifting of icebergs in warming oceans, or the motion of ships with frozen hulls traveling through icy waters. So ice balls are good for physics, not just your coc Njpn Biologists Expose Their Love of Weird Animal Sex in Twitter HumpOff
shows that the number of commercial drone Certificates of Authorization is now almost equal to those from the military. And much of it is happening in California. The drone census pulls data from a number of sources including the Congressional Unmanned Systems Caucus, the Federal Aviation Authority and DIY drone groups, to name a few. The data show some interesting trends like how many of the drone licenses are issued to colleges and universities with especially high numbers in the Rust Belt. Hobbyists, meanwhile, make up a large number of those stanley cup applying for FAA authorization. Perhaps unsurprisingly, though, California is where all the action is happening. The combination of Bay Area tech brain power and Southern California military brawn make California arguably the most active state in the drone ecosystem, report Matt Caccavale and Samra Kas stanley shop im who helped build the map. With seven Unmanned Systems Caucus members, including Chairman Buck McKeon, 80 AUVSI member companies, 22 COA applicants, and 15 DIY groups, California is the current leader in the UAV marketplace. The Congressional Unmanned System Caucus, by the way, includes 48 members of the House with f stanley butelka our Republicans for every Democrat. This map will surely look different in a couple of years, since the drone industry is growing so rapidly. Legislatures across the country will surely struggle to keep up with technology鈥攁ctually, they already are鈥攁nd to deal with public perception of drones vis
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