Introduction-L-Jan13-Ave

Introduction-L-Jan13-Ave - Introduction Introduction...

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PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction Physical Modeling Concepts: -Why study Physics? -Measurement -Significant Figure -Uncertainty -Order of magnitude -Estimation PHYS 1L03, Winter 2010, McMaster University, R.Nejat Example, dimensional analysis • The pressure in a fluid in motion depends on its density ρ and its speed v . Find a simple combination of density and speed that gives the correct dimensions of pressure –Density [M / L 3 ] –Speed [L / T] –Pressure [M / LT 2 ] • So, we have to find a relationship between these three! Introduction PHYS 1L03, Winter 2010, McMaster University, R.Nejat Example, dimensional analysis –Divide the dimension of pressure [ M/LT 2 ] by those of density [M/L 3 ] : – The result has a dimension of speed squared, so: [] 2 2 v T L p = = ρ [] [] 2 v p = 2 v p = = = 2 2 3 LT M T L L M p 2 2 2 3 2 = = = T L T L L M LT M p Introduction PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction • Scientific Notation – A shorthand way of writing very large and/or very small numbers, as a product of a number between 1 and 10 and a power of 10 • Example
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This note was uploaded on 10/02/2011 for the course PHYSICS 1L03 taught by Professor Dudley during the Spring '08 term at McMaster University.

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Introduction-L-Jan13-Ave - Introduction Introduction...

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