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Care must be taken to keep the assistance balanced and coordinated to avoid uneven deloading of the weight and possible torsion injury. [6] If two spotters are unavailable, a single spotter can assist by taking some of the weight off the bar allowing the lifter to return the weight to the rack. A single spotter is referred to as a 'Spinks'. [6]
In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.
Fracture risk calculators assess the risk of fracture based upon several criteria, including bone mineral density, age, smoking, alcohol usage, weight, and gender. Recognized calculators include FRAX , [ 24 ] the Garvan FRC calculator and QFracture as well as the open access FREM tool. [ 25 ]
A sieve analysis (or gradation test) is a practice or procedure used in geology, civil engineering, [1] and chemical engineering [2] to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction ...
Most water in Earth's atmosphere and crust comes from saline seawater, while fresh water accounts for nearly 1% of the total. The vast bulk of the water on Earth is saline or salt water, with an average salinity of 35‰ (or 3.5%, roughly equivalent to 34 grams of salts in 1 kg of seawater), though this varies slightly according to the amount of runoff received from surrounding land.
Lift and drag are the two components of the total aerodynamic force acting on an aerofoil or aircraft.. In aerodynamics, the lift-to-drag ratio (or L/D ratio) is the lift generated by an aerodynamic body such as an aerofoil or aircraft, divided by the aerodynamic drag caused by moving through air.
The size of the English Wikipedia can be measured in terms of the number of articles, number of words, number of pages, and the size of the database, among other ways. As of 21 August 2024, there are 6,870,540 articles in the English Wikipedia containing over 4.6 billion words (giving an average of about 681 words per article).
Sierra Nevada proposed Dream Chaser for the CCDev phase 2 solicitation by NASA in October 2010, with an estimated project cost of less than $1 billion. [34] [35] On 18 April 2011, NASA awarded $80 million to Sierra Nevada Corporation for Dream Chaser. [36] Since then, nearly a dozen further milestones have been completed under that Space Act ...