Introduction-L-Jan17-Ave

# Introduction-L-Jan17-Ave - Introduction Physical Modeling...

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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 Introduction • Example, Estimation –Estimate the mass of your brain and number of cell it contains. • A head = 15 cm wide • A Brain = 10 cm wide •Brain cell Blood cell 10 –5 m • May assume brain density = 1 gr/cm 3 • Assume a cubic brain??? PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction • Example, Estimation Volume of brain: 10cm × 10cm × 10cm = 10 3 cm 3 (10 3 cm 3 ) × (1 m 3 / 10 6 cm 3 ) = 10 –3 m 3 Mass = (density) × (volume) Mass of brain = (1gr/cm 3 ) × (1000 cm 3 ) = 1000 gr = 1000 gr × (1k/1000 gr) = 1 kg Volume of cell = (10 –5 m) 3 = 10 –15 m 3 Number of cell = (10 –3 m 3 / 10 –15 m 3 ) = 10 21 cell/brain PHYS 1L03, Winter 2010, McMaster University, R.Nejat Example, Estimation a. How many dentists are practicing in the

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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-Jan17-Ave - Introduction Physical Modeling...

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