일반물리학 : Lecture 1, Page 1
Introduction Introduction
z Professor Seok Ho Song (송석호)
• 자연과학대학 401호
• 02-2220-0923
• shsong@hanyang.ac.kr
• http://optics.hanyang.ac.kr/~shsong
z References
• http://iphysics.chonbuk.ac.kr/ - 전북대학교 물리학과
• http://www-ph.postech.ac.kr/genphys/gp/ -포항공대
• http://online.physics.uiuc.edu/courses/phys101/spring06/index.
html
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Reading Science Books Reading Science Books
z 매달 한 권 이상씩 – 독후감 제출은 매월 마지막 주 금요일 (3/31, 4/28, 5/26)
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Course Outline Course Outline
z Mechanics
• kinematics
• energy
• momentum
• rotational motion
z Fluids
z Waves
z Heat
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SI Units SI Units
z m : Intervals in space (length)
z kg : Quantities of inertia (mass)
z s : Intervals in time
Chapter 1 : Units, Dimensional Analysis
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Length:
Length:
Distance
Distance Length (m)Length (m)
Radius of visible universe 1 x 1026
To Andromeda Galaxy 2 x 1022
To nearest star 4 x 1016
Earth to Sun 1.5 x 1011
Radius of Earth 6.4 x 106
Sears Tower 4.5 x 102
Football field 1.0 x 102
Tall person 2 x 100
Thickness of paper 1 x 10-4
Wavelength of blue light 4 x 10-7
Diameter of hydrogen atom 1 x 10-10
Diameter of proton 1 x 10-15
• Prefixes : See Table 1-2, p.3
• Significant figures : See Ex. 1-1
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Time:
Time:
Interval
Interval Time (s)Time (s)
Age of universe 5 x 1017
Age of Grand Canyon 3 x 1014
32 years 1 x 109
One year 3.2 x 107
One hour 3.6 x 103
Light travel from Earth to Moon 1.3 x 100 One cycle of guitar A string 2 x 10-3 One cycle of FM radio wave 6 x 10-8 Lifetime of neutral pi meson 1 x 10-16 Lifetime of top quark 4 x 10-25
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Mass:
Mass:
Object
Object Mass (kg)Mass (kg)
Milky Way Galaxy 4 x 1041
Sun 2 x 1030
Earth 6 x 1024
Boeing 747 4 x 105
Car 1 x 103
Student 7 x 101
Dust particle 1 x 10-9
Top quark 3 x 10-25
Proton 2 x 10-27
Electron 9 x 10-31
Neutrino 1 x 10-38
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Dimensional analysis Dimensional analysis
C = root(2)
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Question Question
A very good fastball pitcher can throw the ball 100 mph. What is the ball speed in m/s?
1 - 450 m/s 2 - 45 m/s 3 - 0.045 m/s
correct
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