What is universal set in set theory?
Space and AstronomyIn set theory, a universal set is a set which contains all objects, including itself. In set theory as usually formulated, the conception of a universal set leads to Russell’s paradox and is consequently not allowed. What is universal set and example? A universal set (usually denoted by U) is a set which has elements
What is the surface temp of mercury?
Space and AstronomyThe surface temperature of Mercury, the closest planet to the Sun in our solar system, can vary widely depending on the location and time of day. However, on average, the temperature on Mercury’s surface can range from about -290 degrees Fahrenheit (-180 degrees Celsius) on its night side to about 800 degrees Fahrenheit (430 degrees
Why are asteroids located in the asteroid belt?
Space and AstronomyAsteroids are concentrated in the asteroid belt because of orbital resonances between asteroids and Jupiter. Asteroids with orbital periods that are a simple ratio of Jupiter’s 12-year orbital period experience the same gravitational nudge on a regular basis. Where is the asteroid belt located and why? The asteroid belt is a torus-shaped region in the
How do you solve grouping symbols?
Space and AstronomyHow do you do grouping symbols? Three common types of grouping symbols—parentheses ( ), brackets [ ], and braces { }—are used to group numbers or variables (letters). The most commonly used grouping symbols are parentheses. Operations inside parentheses can be done before any other operations in order to simplify the problem. What is an
What is a function rule?
Space and AstronomyA function rule is the relationship between the dependent and independent variables in the form of an equation. The function rule of a specific function, explains how to determine the value of the dependent variable say y, in terms of the independent variable say x. What is a function rule example? A function is a
Why is Callisto so heavily cratered?
Space and AstronomyCallisto is the most heavily cratered of all of Jupiter’s satellites. The density of the craters indicates that they were produced about four billion years ago, when all the bodies of the solar system came under heavy cometary and meteoroid bombardment. Why is Callisto so cratered? Callisto’s rocky, icy surface is the oldest and most
What are algebraic models?
Space and AstronomyAn algebraic model uses a set of algebra equations to precisely describe a situation. Constructing such models is a fundamental skill required by US standards for both math and science. It is usually taught with algebra word problems. How do you find the algebraic model? Video quote: So we've represented the algebraic expression x squared
What is the postulate of a triangle?
Space and AstronomyThe sum of the angles of a triangle is two right angles. This postulate is equivalent to the parallel postulate. How do you find the postulate of a triangle? If the hypotenuse and one of the legs (sides) of a right triangle are congruent to hypotenuse and corresponding leg of the other right triangle, the
What are the 14 layers in a spacesuit?
Space and AstronomyThe suit itself has 13 layers of material, including an inner cooling garment (two layers), pressure garment (two layers), thermal micrometeoroid garment (eight layers) and outer cover (one layer). What are the layers of a spacesuit? The suit consists of three major layers: the bladder that contains the oxygen, the restraint that provides the structure,
How did the ancient Greek view about motion?
Space and AstronomyHow did the ancient Greeks explain this motion? The Ptolemaic Model By the time of Ptolemy Greek astronomers had proposed adding circles on the circular orbits of the wandering stars (the planets, the moon and the sun) to explain their motion. These circles on circles are called epicycles. What were the early ideas of Greek