Physics 107 Week One Notes
Physics 107 Week One Notes Econ 103-004
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This 3 page Class Notes was uploaded by AngelicaDeMario on Thursday January 28, 2016. The Class Notes belongs to Econ 103-004 at University of Wisconsin - Milwaukee taught by A. Chakrabarti in Summer 2015. Since its upload, it has received 10 views. For similar materials see Principles of Microeconmics in Business at University of Wisconsin - Milwaukee.
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Date Created: 01/28/16
Chapter One: A World View Physics: Study of the material world - Search for patterns, rules, or behavior of object. On Building a World View World View: Shared set of ideas that represents the current explanations of how the material world operates. Physics World is dynamic If there is no relationship between the real world and predicted consequences, the idea is worthless. Common sense is a personal world view. - Our observations are limited by the range of human sensations. Acceptance is based on whether the idea works, how well it fits into the world view, and whether it’s better than old explanations. Bode’s Law: Numerical rule that gave the relative sizes of orbits of the planets. - The radius of Earth’s orbit, the mean distance between Earth and Sun, is known as an astronomical unit. (AU) Measurements Two dominant measure systems are customary (foot, pounds, second) and metric (meter, kilogram, and second). Common unit of length on the astronomical scale is light years. Sizes: Large and Small 2 Powersoften Notation: Displays the number of 0’s in numbers ( 10 =10x10 ) Exponent: Number of 10’s that are multiplied together. Order of Magnitude: For a quantity is its value rounded off to the nearest power of 10. 41 Size of the visible universe is 10 times the size of protons and neutrons. Divide two powers of 10 by subtracting the exponents, but keep base as is. Positive exponents=large numbers, Negative exponents=small numbers. Summary For a new idea to be accepted, it must 1. Agree with the existing data, 2. Make predictions than can be tested, and 3. Have a scientific basis. Continuation, Leading to Chapter Two Heavy Objects vs Light Objects The need for units/ units of length AND of time. - Units are arbitrary. We can choose ta our own convenience, or inconvenience, in case of certain systems. We see that if we simply introduce a new unite every time we meet a new physical quantity, we would have a vast table of conversion factors. LengthThe Meter - Was: One tenmillionth of the distance from North Pole to Equator. - Now: Distance travel by light in a vacuum in 1/299,792,458 of a second Mass: Kilogram - One Kilogram is the mass of a particular platinumiridium cylinder kept at International Bureau of Weights and Standards; Sèvres, France. Time: The Second - One second is the time for radiation from a cesium133 atom to complete 9,192,631,770 oscillation cycles. Basic Quantity Unit Mass Kilogram (kg) Length Meter (m) Time Seconds (s) Electric Current Ampere (A) Amount of Matter Mole (mol) Kelvin (K) Temperature Interval 1905 Einstein’s Theory of Relativity played with the idea that TIME was relative. Classical Time: Newton’s assumption of “common time” which talks about two observers in motion relative to each other to produce a mathematical concept of time.
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