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Unformatted text preview: College Physics Chapter 1 Introduction Theories and Experiments ¡ The goal of physics is to develop theories based on experiments ¡ A theory is a mathematical expression, about how a system works ¡ The theory makes predictions about how a system should work ¡ Experiments check the theories’ predictions ¡ Every theory is a work in progress From Astronomical scales.. http://antwrp.gsfc.nasa.gov/apod/archivepix.html ~ 10 21 m ..to planetary scales.. Why do we always see only one half of the moon? ~ 10 6 m ..to the microscopic and smaller Atomic scale image of graphite taken in the Biswas lab. ~ 10-10 m Fundamental Quantities and Their Dimension ¡ Length [L] ¡ Mass [M] ¡ Time [T] ¡ other physical quantities can be constructed from these three You will need a few more in PHY 2054 Units ¡ To communicate the result of a measurement for a quantity, a unit must be defined ¡ Defining units allows everyone to relate to the same fundamental amount Systems of Measurement ¡ Standardized systems ¡ agreed upon by some authority, usually a...
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