Reading Science Books Reading Science Books

일반물리학 : Lecture 1, Page 1

Introduction Introduction

z Professor Seok Ho Song (송석호)

• 자연과학대학 401호

• 02-2220-0923

• [email protected]

• 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

일반물리학 : Lecture 1, Page 2

Reading Science Books Reading Science Books

z 매달 한 권 이상씩 – 독후감 제출은 매월 마지막 주 금요일 (3/31, 4/28, 5/26)

일반물리학 : Lecture 1, Page 3

Course Outline Course Outline

z Mechanics

• kinematics

• energy

• momentum

• rotational motion

z Fluids

z Waves

z Heat

일반물리학 : Lecture 1, Page 4

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

일반물리학 : Lecture 1, Page 5

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

일반물리학 : Lecture 1, Page 6

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

일반물리학 : Lecture 1, Page 7

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

일반물리학 : Lecture 1, Page 8

Dimensional analysis Dimensional analysis

C = root(2)

일반물리학 : Lecture 1, Page 9

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

일반물리학 : Lecture 1, Page 10

Question Question

Can two nonzero perpendicular vectors be added together so that their sum is zero?

No!