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The magnetic property most useful in stratigraphic work is the change in the direction of the remanent magnetization of the rocks, caused by reversals in the polarity of the Earth's magnetic field. The direction of the remnant magnetic polarity recorded in the stratigraphic sequence can be used as the basis for the subdivision of the sequence ...
In mathematics and physics, the plate trick, also known as Dirac's string trick (after Paul Dirac, who introduced and popularized it), [1] [2] the belt trick, or the Balinese cup trick (it appears in the Balinese candle dance), is any of several demonstrations of the idea that rotating an object with strings attached to it by 360 degrees does not return the system to its original state, while ...
The back extension is performed while lying face down partway along a flat or angled bench, so that the hips are supported and the heels secured, by bending down at the waist and then straightening up again. This is a compound exercise that also involves the glutes. Equipment Body weight, dumbbell or back extension machine. Major variants
Weight plates may incorporate holes for ease of carrying (called "grip plates") or be solid discs (especially those used for competition). Non-competition plates often have variable diameters and widths, such as on the adjustable dumbbells pictured right, with heavier plates generally being larger in diameter, thickness, or both.
Arago's rotations is an observable magnetic phenomenon that involves the interactions between a magnetized needle and a moving metal disk. The effect was discovered by François Arago in 1824. At the time of their discovery, Arago's rotations were surprising effects that were difficult to explain.
To perform the Russian twist one sits on the floor and bends both knees while feet are kept together and held slightly above the ground (or put under a stable surface). ). Ideally, the torso is kept straight with the back kept off the ground at a 45-degree angle with arms held together away from the body in a straight fashion and hands kept locked together like a ball or one can hold a weight ...
Williams first published his own modified exercise program in 1937 for patients with chronic low back pain in response to his clinical observation that the majority of patients who experienced low back pain had degenerative vertebrae secondary to degenerative disk disease. [1] These exercises were initially developed for men under 50 and women ...
Computer rendering of Euler's Disk on a slightly concave base. Euler's Disk, invented between 1987 and 1990 by Joseph Bendik, [1] is a trademarked scientific educational toy. [2] It is used to illustrate and study the dynamic system of a spinning and rolling disk on a flat or curved surface. It has been the subject of several scientific papers. [3]
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