Variable pricing allows different rates to be extended to different customers for the same goods or services, and is used in cultures where weighting the price of products is considered the norm or in bidding situations. It differs from fixed pricing, which extends the same price to all purchases made during a specified time period. […]
The Earth was stagnant for about a billion years between 800 million and 1.8 billion years ago, stalling evolution due to a lack of trace metal nutrients in the oceans. Evolution resumed over 200 million years, leading to today’s biodiversity. The text also includes interesting facts about blue eyes and dog breeds, and clarifies Charles […]
Variable pitch propellers allow pilots to adjust engine speed and blade position for optimal thrust. They improve aircraft and ship performance and were first used in aircraft in 1910, with demand increasing during World War II. Variable pitch propellers allow the pilot to adjust the position of the propellers and engine speed for any situation […]
The lathe is the oldest machine tool and a key technology of the industrial revolution. Variable speed lathes are important for controlling spindle speed, which affects torque and cutting speed. Different materials require different speeds, and variable speed lathes can be operated by foot, belts and pulleys, or electronic controls. A lathe, which is a […]
Variable resistance weight lifting provides consistent resistance throughout the movement, resulting in a more intense workout and improved muscle strength. Specialized machines are required, but it provides a more comprehensive workout for stabilizer muscles. However, it is limited to one type of lift and requires multiple machines for a full-body workout. In fitness, variable resistance […]
Variable data printing (VDP) allows for personalized printing without interrupting the process. It has become popular in marketing, customer relations, and book publishing. VDP software includes raster image processors and print stream methods. VDP has increased ROI for marketers and is used in book publishing and email marketing. The industry is predicted to continue growing […]
An independent variable is a variable that is manipulated to measure the change in another variable, called the dependent variable. It is the variable that can be controlled and there should only be one in any scientific experiment. In mathematics, the independent variable is one whose value does not depend on any other variable. An […]
Variable bit rate (VBR) adjusts the number of bits used to encode audio depending on complexity, resulting in higher quality sound than constant bit rate (CBR), but longer encoding times and potential memory issues. VBR ranges from 128-320 Kbps, while lossless compression provides even higher quality but larger file sizes. CBR uses a constant bit […]
Object-oriented programming uses public and private modifiers to show or hide information. Dynamic variables are fluid and can change, while static variables are fixed. Vending machines use dynamic variables to track product quantity. Good practice is to name variables according to their purpose. In object-oriented programming, an object can hide or reveal its attributes, or […]
Variable air volume (VAV) is a heating and cooling strategy that adjusts the amount of air pumped into a space based on temperature and energy requirements. Systems range from simple on/off to sophisticated software-controlled options, with some allowing for efficient airflow to specific areas. Variable air volume, or VAV, is a type of heating and […]
Categorical variables have two or more groups without order, while quantitative variables have numerical values. Ordinal variables have an inherent order, and data tables and bar charts are used to analyze categorical data. A categorical variable, also called a nominal variable, is a type of variable that can have two or more groups, or categories, […]
Latent variables are undefined elements in statistical analysis and computer science. They can be hidden or hypothetical and are often excluded from constructs. Latent variable models compare observed variables to latent ones to understand underlying conditions. They are important in research but can be complicated to model. A latent variable is a variable that cannot […]
Integer variables store only whole numbers in computer programming and cannot store decimal values or other data types. They are useful for extracting integers from decimal values. Variables in programming allow for explicit declaration of data types, unlike algebraic variables. Different data types cannot perform logical calculations on each other. Explicit declaration is necessary to […]
Variable stars have a brightness that changes from Earth’s perspective. They are of interest to astronomers and can be intrinsic or extrinsic. Amateur astronomers can contribute to research by collecting data. A variable star is a star with a brightness that varies from the perspective of an observer on Earth. Some variable stars have variations […]
Variable annuities are life insurance policies that invest in a portfolio of equity and debt securities, with payments adjusted based on the yield. However, they can be risky due to market fluctuations, and payment schedules can be selected by the investor. Variable annuities are a structure for life insurance policies that are intended for the […]
