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Unformatted text preview: Chagter 1 Introduction 1.1 Standards of Length, Mass, and Time The metric system is also known as the “S I” system of units. (S I = Systeme International). A. Length The unit of length in the metric system is the meter. B. Mass The unit of mass in the metric system is the kilogram. C. Time The unit of time in the metric system is the second. The metric system is also known as the “mks” system of units. Mass is a quantity used to measure the resistance of an
object to changes in its motion. Mass is a measure of the
Inertia of the object. Galileo was the ﬁrst person to introduce the concept of inertia. 1.3 Density The mass density p of any object is deﬁned as the mass _M
i “V I for liquid water at STP, p 2 1.0 g/cm3 = 1000 kg/m3 per unit volume, i.e., 1.5 Conversion of Units Units can be treated as algebraic quantities that can 02111061 each other. Do problem 19 in chapter 1... 1.7 Signiﬁcant ﬁgures A signiﬁcant ﬁgure is a reliably known digit... A. Adding or Subtracting Numbers: The number of decimal places in the result should
equal the smallest number of decimal places of any term in the sum (or subtraction). That is (1) 23.45 +1.345=24.795 :3 24.80 (2) 56— 34.56 = 21.44 :3 21 B. Multiplying or Dividing Numbers: The number of signiﬁcant ﬁgures in the ﬁnal product
is the same as the number of signiﬁcant ﬁgures in the factor having the lowest number of signiﬁcant ﬁgures. That is,
(1) 123.56 x 7.89 = 974.8884 :3 975 (2) 564 / 00034 = 165882352941 2 1.711(105 ...
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This note was uploaded on 08/22/2009 for the course PHYS 7A taught by Professor Guerra during the Spring '08 term at UC Irvine.
- Spring '08