MAE103L/201/1/2019 Dear student We are giving you some feedback on Assignment 02 (semester 1) Question 1 1.1 Cubit, unit of linear measureused by many ancient and medieval people, was based on the length of the arm from the elbow to the tip of the middle finger. Generally taken as equal to 18 inches (457 mm), although in some ancient cultures it was as long as 21 inches (531 mm). 1.2 Celsius and Fahrenheit are units to measure temperature on different scales. They are related by the formulaቀݔ Ԩ ൈଽହቁ 32 ൌ ݕ Ԭ,where x and y are temperatures in Celsius and Fahrenheit degrees respectively. 1.3 SI is the abbreviation for a system of physical units (SI units) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten. 1.4 The Babylonians contribution to modern time was the “sexagesimal” system—the numbering system we use to tell time today. This system operates off of what mathematicians call “base 60″—a mathematical structure that counts from 1- 60. In contrast, the decimal system that we use for almost everything else uses base 10—just the numbers 0-9 —but we keep the sexagesimal system around for three things: measuring time, measuring angles, and finding geographical coordinates. 1.5 1݅݊ ൌ 2.54 ܿ݉1.6 Tare is sometimes called unladen weight. It is the weight of an empty vehicle. By subtracting it from the gross weight (laden weight), the weight of the goods carried (the net weight) may be determined. 1.7 Solstice - the times when the Sun is at its furthest from the celestial equator are called the summer and winter solstices. Equinox - the two points in the year when the Sun illuminate the Northern and Southern Hemispheres equally. 1.8 A hectare is a metric unit of square measure, equal to 100 acres (2.471 acres or 10,000 square metres). 1.9 1݈ ൌ 1000 ܿ݉ଷ1.10 98.6°F (37°C). 1.11 The trundle wheel is a measuring device, a simplified form of a surveyor's wheel. It is commonly used by people who need an easy way to find the rough distance from one place to another.