Spring 2010 PHYS 116-002 Lectures -- Part 1

Spring 2010 PHYS 116-002 Lectures -- Part 1 - Lecture 1...

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Lecture 1 Today: (Chap. 1) Measurements and units Time, length, mass, etc Orders of magnitude Next lecture: (2-1 to 2-7) Motion along straight line Kinematics: position, velocity, and accelerations
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SI units of measurements Time: second (s) Atomic standard: 1s is the time taken by 9 192 631 770 oscillation of light emitted by a cesium-133 atom. Length: meter (m) Atomic standard: 1m is the distance travel by light in vacuum during 1/c second. Mass: kilogram (kg) Atomic standard: The mass of a carbon atom is 12 atomic mass units (u) 1u=1.6605302 x 10 -27 kg. Speed of light: c =2.99792458 x 10 8 m/s
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Orders of Magnitude
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Time X-ray ~ 1/(10 -15 s) Microwave freq ~ 1/(10 -9 s) Music frequency ~ 1/(10 -3 s) Heart beat ~ 1 s A day ~ 10 5 s A year ~ 10 7 s Jurassic age ~ 10 15 s Age of universe > 10 17 s Length Quark ~ 10- 16 m Atoms ~ 10 -10 m Virus ~ 10 -8 m Human ~ 1 m Earth ~ 10 7 m Star ~ 10 12 m Galaxy ~ 10 19 m Universe > 10 26 m
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Assignment # 1 MasteringPhysics problems: 10 problems. Due time: Jan. 15, 11:59 pm.
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Lecture 2 Last lecture: Measurements and units Time, length, mass, etc Orders of magnitude Today: Position, velocity, and accelerations Motion along straight line Next lecture: Free falling body (2-7 to 2-10) Vectors (3-1 to 2-3)
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The SI standard of length is based on: A. the distance from the north pole to the equator along a meridian passing through Paris B. wavelength of light emitted by Hg198 C. wavelength of light emitted by Kr86 D. a precision meter stick in Paris E. the speed of light Estimate the number of times your heart beats in a month A) 3x10 3 B) 3x10 4 C) 3x10 5 D) 3x10 6
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Kinematical Variables Displacement x defines the change of position Velocity v describes the rate of change of position Acceleration a describes the rate of change of velocity. 1 2 1 2 avg Velocity Average t t x x t x v v 1 2 x x x t x v t 0 lim Velocity eous) (Instantan 1 2 1 2 avg on Accelerati Avg. t t v v t v a a t v a t 0 lim on Accelerati
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Graphical Relationships Graphs show x , v , and a versus time for an elevator passenger Note Note how the slope and curvature of the position graph relate to the v(t) and a(t) graphs Note what the passenger feels 2 2 ) ( and ) ( dt x d dt dv t a dt dx t v
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Straight line motion For a straight line motion: t t dt t v x t x dt t a v t v 0 0 0 0 ) ( ) ( ; ) ( ) ( For a straight line motion: ) ( 2 2 1 0 2 0 2 2 0 0 0 x x a v v at t v x x at v v
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The Cop and the Red Light Runner A motorist traveling at 31mi/hr 14m/s runs a red light. A cop starts immediately to chase, with acceleration 2.8m/s 2 How far will they both travel before the cop catches the motorist? How long does it take the cop to catch the motorist?
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This note was uploaded on 03/14/2011 for the course PHYS 116 taught by Professor Engle during the Spring '08 term at UNC.

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Spring 2010 PHYS 116-002 Lectures -- Part 1 - Lecture 1...

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