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(PHYS002)[2005](s)quiz~789^_10004.pdf
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PHYSICS 002
Midterm 1
Date: 15 March 2005
Time allowed: 70 minutes
Total: 70 marks



Section Marks
A
B
C1
C2
Total

Useful data:

-2K-4
Stefan-Boltzmann Constant = 5.67 10-8 Js-1m
Section A: Multiple choice (16 marks)
(1)
Galileos telescopic discovery of moons orbiting Jupiter was important because it showed that

A. the universe could contain centres of motion other than Earth.
B. even if Earth moves along an orbit, it is possible that the Moon is not left behind.
C. Jupiter was much more massive than Earth.
D. all of the above.
E. A and B above Answer:

(2)
The conservation of angular momentum can explain:

A. planets with elliptical orbits move faster when they are closer to the Sun.
B. comparing different planets, those with larger orbits have longer periods.
C. the Moon has a centripetal acceleration towards Earth.
D. the escape velocity of a planetary orbit is 2 times its circular orbital velocity.
E. planetary orbits can be either open or close. Answer:

(3)
One night you observe that the star Sirius crosses the meridian at midnight. About what time will it cross the meridian one month later?

A. 10 pm
B. 12 am
C. 1 am
D. 3 am

E. 5 am Answer:

(4)
When viewed from the North, the orbit of Jupiter around the Sun is anticlockwise, and the sidereal period is 4334 days. When viewed from the North, the Jupiter rotates anticlockwise about its axis in 10 hours. The Sinope is a satellite of Jupiter. Its orbit around Jupiter is clockwise when viewed from the North, and the sidereal period is 758 days. Which of the following is correct?


A. When viewed from Jupiter, Sinope rises in the West and sets in the East.
B. When viewed from Jupiter, Sinope rises slightly later every night.
C. On Jupiter, one solar day is shorter than one sidereal day.
D. The sidereal period of Sinope is longer than its synodic period.
E. Sinope can never be seen from Jupiter at midnights.
Answer: Part B True or False (18 marks, 2 marks for each correct answer, minus 2 marks for each incorrect answer, minimum 0 mark for Part B)

True False
(1) If the moon is in the third quarter phase, it will rise in the East at midnight.
(2) The M spectral type stars are the furthest from the Earth since they are the faintest stars.
(3) A Doppler shift changes the positions of both continuum and lines of a stellar spectrum.
(4) Two stars have equal strengths of their hydrogen lines. Star A has lines from helium present while star B has lines of ionized calcium present so one can conclude that star B is hotter than star A.

(5-6) How does a 5-m ground-based telescope compare with the 2.4 m Hubble Space telescope?
(5) The Hubble Space Telescope has a larger light gathering power.
(6) The Hubble Space Telescope can observe a wider spectrum of electromagnetic radiation.

(7-8) Star A is a star with the same density as the Sun, and its surfac