SE101 Study Guide - Quiz Guide: Ethical Egoism, Observational Error, Virtue Ethics
20 Nov 2012
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Measurement: observed physical quantity, two parts, numerical value, reference standard consisting of a combination of units, should be accurate and repeatable. Unit: standard quantity used as a reference for measurements, specific reference quantities used in measurements, eg: metres, feet, amperes, and newtons. Dimensions: quantity measured, eg: distance, current, and force. Absolute: use mass as a fundamental unit. Gravitational: use force as a fundamental unit. Hybrid: use both mass and force and fundamental units. Popular unit systems: si (systeme international d"unites) Commonly known as international system of units . Writing quantities with units: number/formula half/full space si unit symbols, 59. 7u2 kg. Systematic: consistent deviation in a measurement, also called bias or offset, same sign/magnitude, types. Random: small variations in measurements, may be positive or negative, no obvious bias. Average bias approaches 0 as more measurements are taken: possible sources. Exerting different pressure when measuring with micrometer. Connecting instrument in slightly different fashion each time.
