Leif Ristoroff physicists and applied mathematicians At New York University, he was experimenting with how clay erodes in response to water flow when he noticed a small shape emerging that resembled a sitting lion. So, essentially, it’s a miniature version of a lion. great sphinx of giza In Egypt. Further experiments have provided evidence supporting the long-held hypothesis that natural processes first created the landforms known as landforms. yardangHumans then added details to create the final statue. Initial results were first published last year as part of the American Physical Society’s Fluid Motion Gallery, and the full paper will be published this week in the journal Physical Review Fluids.
“Our results suggest that sphinx-like structures can form under very common conditions,” wrote Ristroph et al. in their paper. “These discoveries do little to solve the mystery behind the Yardan and the Great Sphinx, but perhaps they do wonder what awe-inspiring formations ancient people encountered in the Egyptian desert and why they were It makes us wonder if we were imagining the creature above.”
2018, Ristlov Applied Mathematics Laboratory Tweaked the recipe To create the perfect bubble, based on experiments with thin films like soap, we determined exactly the wind speed required to push the film and form bubbles, and how that speed depended on parameters such as the size of the wand. We have identified how it depends. (You will need a circular wand with a circumference of 1.5 inches, and you will need to blow gently at a constant 6.9 cm/s.)
Last year, Ristlov’s group conducted a series of experiments using paper airplanes. Explore Study fundamental aerodynamics and develop useful mathematical models to predict flight stability. It was already well known that shifting the center of gravity would result in different flight trajectories, some of which would be more stable than others.
The team verified this by test-flying different rectangular shapes of paper and changing the weight on the front by adding a thin metal tape to one end. If the weight is at or near the center of the wing, the plates will flap and tip over erratically. If the center of gravity moves too far toward one end, the plates will swoop down too quickly and collide. The proverbial “sweet spot” was the emphasis between these two extremes. In this case, the aerodynamic forces on the airplane’s wings push the wings back down when they move up, and push them back up when they move down. This means that the center of pressure changes depending on the flight angle, ensuring stability.
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Most relevant to this latest research is that of Risttroph. 2020 Papers So-called “stone forests” (technically a type of stone forest) common in certain regions of China and Madagascar karst landform), as famously stone forest Located in Yunnan province, China. They conducted simulations and experiments to investigate the interesting shapes that evolve in the landscape through a number of “formation” processes, particularly erosion and dissolution.
Listoroff et al. They concluded that these spiky rock formations result from the dissolution of solids into liquids in the presence of gravity, resulting in natural convection. Soluble rocks such as limestone, dolomite, and gypsum sink in water, and the minerals slowly dissolve into the surrounding water. Then, the heavy water sinks under the force of gravity, and the flow gradually forms a karst topography. When the water recedes, a forest of pillars and stones appears.
