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PHYSICS 1002
Mid-term Examination

31 Oct 2012

Time allowed: 70 minutes
Total: 100 marks


Name:
Student ID:
Seat:



Section
Marks

A


B:P1


B:P2


Total




Table 1: Relevant Data

1 year
3.15 x107 sec

1 Astronomical Unit (AU)
1.5 . 108 km

Speed of light
3 . 108 m/s

Mass of the Sun (MSun)
1.99 . 1030 kg

Gravitational constant (G)
6.67 x 10-11 m3s-2kg-1

StefanCBoltzmann constant ( .)
5.67 . 10-8 W/(m2 K4)



Answer ALL Questions.

Section A: Multiple-choice questions (3 marks/ per question, in total 60 marks)

(1) If light takes 8 minutes to reach Earth and 5.3 hours to reach Pluto from the sun, what is the approximate distance from the sun to Pluto?
A. 5.3 AU
B. 40 AU
C. 40 ly
D. 5.3 ly
E. 0.6 ly
Answer: B
Explanation: X/1AU = 5.3 .60 min / 8min, so X = 39.75 ~ 40AU.


(2) Which of the following is an example of conservation of angular momentum?
I.
A diver slowing his somersault by moving from a tuck, or curled, position to a layout, or open, position

II.
A skater speeding up a spin by pulling her arms and legs closer to her body.

III.
A basketball that spins slower and slower as it spins on your finger.

IV.
An artificial satellite moving faster at the closest point than at the most distant point to earth.



A. I. only
B. I and II only
C. II and III only
D. I, II, and III only
E. I, II, and IV only
Answer: E

(3) Which of the following can be determined by using the Doppler effect?

I.
The radial acceleration of a spaceship leaving the earth.

II.
The transverse velocity of a star.

III.
The radial velocity of a star.

IV.
The speed at which a car is traveling toward an observer.



A. I & IV
B. II & III
C. II & IV
D. I & III
E. I, III, & IV

Answer: E
Remarks: Someone may argue that the transverse Doppler effect in relativity could also lead to spectral shift due to the transverse motion of the emitter. However this effect can only provide the magnitude of the transverse motion of the emitter and its direction cannot be determined. So option II, The transverse velocity of a star is not among the correct options..

(4) Determine which of the following statements about eclipses is true


A. A total lunar eclipse is visible only from the path of totality for the solar eclipse.
B. If you were on the moon during a total lunar eclipse, you can see the photosphere of
the sun.
C. During an annular solar eclipse, the angular size of the moon is smaller than that of
the sun.
D. Lunar eclipse occurs when the moon travels between the Sun and the Earth,
blocking the Suns light from the Earth in the middle of the day.
E. A solar eclipse occurs during a full moon.

Answer: C

(5) Determin