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(PHYS002)[2010](s)midterm~1907^_10523.pdf
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Q1-Q6
Q7-Q11
Q12-Q17
Q18-Q22
Q23-Q28
Q29-Q33
Q34-Q36

A
A
A
C
C
B
A

C
E
C
B
B
C
A

D
B
E
C
B
C
D

D
C
D
B
B
A


B
E
D
D
D
E


B

B

A





Section B:
P1.
a) If the Moons orbit is in the ecliptic plane, then eclipses can occur every month. 4 points
b) The self-rotating direction or the orbiting direction is inversed. (which means this two directions cant be the same. Other assumptions which can obey the physics law are OK.) 4 points
P2 a) Problems description: the bottom of the photograph is the local horizon. We know that the distance from center of the concentric circle in the photo to the bottom corresponds to 1904926, which is the latitude of the Observatory. The reason is the bottom corresponds to the edge of the circumpolar region. (See picture on Page 31 of the book) By measuring the dimension of the photo, the distance is 2.32cm, and the height & width are 4.85cm, 4.97cm respectively. Therefore,
the angle size of height is (latitude)*(4.85/2.32)=4102632
the angle size of width is (latitude)*(4.95/2.32)=420283
Criteria: You should know the principle of this method and do some necessary measurements which are required.
b) The strict definition of circumpolar is such stars that never rise or set but instead make daily counter-clockwise circles around the north celestial pole. As shown in the graph, all stars inside the red circle should be regarded as circumpolar.


Criteria: If you just indicate the center of this re circle, you will get 1 point. If you mention the nearby region but not exactly point out the whole area, you will get 2 points.


c) The angle from the south celestial pole can a star be seen from the Germini North Observatory should be equal to the angle between zenith & celestial equator, which is the latitude of this location. (1904926)
(Some students missed the question)

P3.
(a) South 2 marks.
Since the latitude of Hong Kong is N 22 16, so you will be facing south in order to make the observation at noon.
(b) 2 marks (c)4 marks (d) 2 marks

Summer solstice (1 mark)


Winter solstice (1 mark)

South

horizon

celestial equator (2 mark)










Vernal equinox and Autumnal equinox(2 mark)