PHYS1171 Lecture Notes - Lecture 1: Thermodynamic Temperature, Luminous Intensity, Ampere
Document Summary
Characteristics of biological systems: change over time, examine well-defined parts of our surroundings, experiments or controlled studies (practical work) A unit is an agreed upon amount of some physical quantity. Type of physical quantity metre second kilogram ampere kelvin candela mole. K cd mol units so that the ratio is equal to one. e. g. 5min = 5min x (60secs/1min) = 300secs. The number of digits you should quote in a value how precise the value is known. A calculated answer is only known as precisely as the least precise of the values that were given combined to exact the answer: hence, answer should always be in the lowest sig. figs. Scientific notation: e. g. 1) 0. 00089 = 8. 9 x 10-4 (2 sig. figs. ) 5. 82 = 5. 82 x 100 (3 sig. figs. ) e. g. 2) 5. 0km/hr 1. 38*m/s (3 sig. figs. ) (times it by the fractions) 1. 4m/s (2 sig. figs. ) Quiz: minutes (min) is an si unit.
