TABLE 6 Approximate Times of Familiar Events

TABLE 4 Approximate Lengths of Familiar Objects

Classical Physics - Physics theories and other related topics
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FUNDAMENTAL DIMENSIONS Unit Systems CP-01 Page 6 Rev. 0 TABLE 6 Approximate Times of Familiar Events Event Time (seconds) Age of Earth 2 x 10 Human Life Span 2 x 10 Earth Rotation Around Sun 3 x 10 Earth Rotation Around Axis 8.64 x 10 Time Between Heart Beats 1 17 9 7 4 Derived Measurements Most physical quantities have units that are combinations of the three fundamental dimensions of length, mass, and time. When these dimensions or measurements are combined, they produce what are referred to as derived units. This means that they have been "derived" from one or more fundamental measurements. These combinations of fundamental measurements can be the combination of the same or different units. The following are examples of various derived units. Area Area is the product of two lengths (e.g., width x length for a rectangle); thus, it has the units of length squared, such as square inches (in. ) or square meters (m ). 2 2 1 m x 1 m = 1 m² 4 in. x 2 in. = 8 in.² Volume Volume is the product of three lengths (e.g., length x width x depth for a rectangular solid); thus, it has the units of length cubed, such as cubic inches (in. ) or cubic meters 3 (m ). The MKS and CGS unit systems have a specific unit for volume called the liter 3 (l). One liter is equal to 1000 cubic centimeters (1 l = 1000 cm ). 3 2 in. x 3 in. x 5 in. = 30 in.³

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