重力與廣義相對論 東海大學物理系‧施奇廷 2015/6/13. 自然科學概論 what is...
Post on 19-Dec-2015
222 Views
Preview:
TRANSCRIPT
自然科學概論
Nicolaus Copernicus (1473~1543)
1. There is no one centre in the universe.
2. The Earth's centre is not the centre of the universe.
3. The centre of the universe is near the sun.
4. The distance from the Earth to the sun is imperceptible compared with the distance to the stars.
5. The rotation of the Earth accounts for the apparent daily rotation of the stars.
6. The apparent annual cycle of movements of the sun is caused by the Earth revolving round it.
7. The apparent retrograde motion of the planets is caused by the motion of the Earth from which one observes.
1514, Little Commentary
自然科學概論
Tycho Brahe (1546~1601)“The square of the year of a planet is proportional to the cube of its average distance from the sun.”
~ 1609, “On the Motion of Mars”
自然科學概論
彎曲多少? 若電梯寬度為 L ,加速度為 g ,在光線由左到右其間,
電梯上升了 h 整個過程耗費時間: t=L/c h = gt2/2 = gL2/(2c2) 偏折角度:
22sin~
c
gL
L
h
自然科學概論
重力透鏡 (Gravitational Lenz)
M: 太陽質量 = 1.989×1030 kg
r: 太陽半徑 = 6.96×108 m
G: 重力常數 = 6.67×10-11 Nm2kg-2
0139.0"75.14
2
rc
MG
自然科學概論
Gravitational Time Dilation
重力也會讓時間變慢 考慮以下系統:
2
2
2222
2
21
'
/
/1/1'
,
RcGM
tt
aRGMg
caR
t
cwR
tt
RwaRwv
top related