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...Lecture math preliminaries and introduction to vectors chapter units physical quantities dimensions physics is a science of measurement the things which are measured called dened by describing how they be there three fundamental in mechanics length mass time all other combinations these basic must have attached them standard system si systeme internationale or equivalently metricsystem this uses meters m kilograms kg seconds s with abbreviations for one can also said using mks an example derived quantity density per unit volume lot formulas equation very powerful tool working out problems equations dimensional analysis left side formula same as right terms important skill acquire art guesstimation approximating answer problem related that appreciation sizes orders magnitude too big small standards kilogram platinum iridium alloy cylinder cm diameter height kept at international bureau weights measures sevres france countries duplicates secondary their own domestic bureaus finally terti...