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In astronomy, Kepler's laws of planetary motion, published by Johannes Kepler between 1609 and 1619, describe the orbits of planets around the Sun.The laws modified the heliocentric theory of Nicolaus Copernicus, replacing its circular orbits and epicycles with elliptical trajectories, and explaining how planetary velocities vary.
Aluminium ring moved by electromagnetic induction, thus demonstrating Lenz's law. Experiment showing Lenz's law with two aluminium rings on a scales-like device set up on a pivot so as to freely move in the horizontal plane. One ring is fully enclosed, while the other has an opening, not forming a complete circle.
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Child labor laws in the United States address issues related to the employment and welfare of working children in the United States. The most sweeping federal law that restricts the employment and abuse of child workers is the Fair Labor Standards Act of 1938 (FLSA), which came into force during the Franklin D. Roosevelt administration . [ 1 ]
The Election Integrity Act of 2021, originally known as the Georgia Senate Bill 202, [1] [2] is a law in the U.S. state of Georgia overhauling elections in the state. It replaced signature matching requirements on absentee ballots with voter identification requirements, limits the use of ballot drop boxes, expands in-person early voting, bars officials from sending out unsolicited absentee ...
Hy's law is a rule of thumb that a patient is at high risk of a fatal drug-induced liver injury if given a medication that causes hepatocellular injury (not Hepatobiliary injury) with jaundice. [1] The law is based on observations by Hy Zimmerman, a major scholar of drug-induced liver injury.
Okun's law is an empirical relationship. In Okun's original statement of his law, a 2% increase in output corresponds to a 1% decline in the rate of cyclical unemployment; a 0.5% increase in labor force participation; a 0.5% increase in hours worked per employee; and a 1% increase in output per hours worked (labor productivity).
Many remarkable phenomena can be explained using quantum mechanics, like superfluidity. For example, if liquid helium cooled to a temperature near absolute zero is placed in a container, it spontaneously flows up and over the rim of its container; this is an effect which cannot be explained by classical physics.