CHS 1440 Lecture Notes - Lecture 1: Significant Figures, Elastic Modulus
2 Oct 2017
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Accuracy- indicates how close the observed value is to the true value. Precision - the spread in values obtained from the measurement. Any zeroes between two significant digits are significant. Only final zeroes in the decimal portion is significant: . 00500 has 3 significant figures, 3. 11 10^5 (3 significant figures) Definitions (i. e. 12 in = 1 ft) Those that came from a direct count (400 students in the room = 400. 0000) For multiplication and division its determined from the one with the fewest sf. Multiply normal, then round based on sf. I. e. a chain is no stronger than its weakest link. For addition and subtraction, add everything normally and then round then round based on the weakest sf number in the problem. If a number is odd round down, even round up. Ratios represent the relationship between two quantities that can be expressed in two ways. Yield strength - measures force needed to produce a specific deformation of a material.
