PSC 1121 Lecture Notes - Lecture 2: Kilogram, Significant Figures, Sony Ten
Document Summary
Scale: the method in which we use to estimate and measure distances and sizes, we need a convenient method to represent algebraically (and also compare) sizes of a whole. In everyday life we use our size as scale to decide if an object is large or small spectrum of objects that can be very small or very large. Atoms and galaxies: a convenient way is the representation of numbers with the power of 10 method and the order of magnitude approximation. Prefixes are standard letters that are attached in front of a unit and make a multiple of some power of. Measurements and significant figures: when we measure any quantity we can do so with only a certain precision, we state our knowledge of a measurement through the use of significant figures: digits that are reliably known. The(cid:396)e a(cid:396)e (cid:395)uestio(cid:374)s like (cid:862)how fast(cid:863), (cid:862)how fa(cid:396)(cid:863), o(cid:396) (cid:862)how (cid:373)uch,(cid:863) which whe(cid:374) a(cid:374)swe(cid:396)ed, we (cid:373)ust supply a unit of measurement.
