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Physics 002 Midterm 1 9 October, 2001.
Time allowed: 75 minutes Total: 80 marks


Name:

Student ID:
A




Part A Multiple choice (4 marks each):

(1) At 3 am, Moon is seen at 45o above the East horizon. The phase of Moon is
A.
new


B.
crescent


C.
quarter


D.
gibbous


E.
full Answer: C




Explanation: As seen from above the North pole,


















(2) Some scientists suggest that a radio telescope should be built with two receivers, one on Earth and one on Moon. Compared with Earth-bound radio telescopes, its most important advantage is that:
A.
it reduces atmospheric scattering.


B.
it increases the resolving power by reducing seeing.


C.
it increases the resolving power by increasing the light gathering power.


D.
it increases the resolving power by combining distant and interfering signals of radio waves.


E.
it increases the resolving power by reducing diffraction through the aperture formed by the Earth-Moon distance.

Answer: D




Explanation: This is the principle of radio interferometry.

(3) At the Summer solstice, the noon Sun at a city has an angle of elevation of 80o to the South. At the Winter solstice, the angle of elevation of the noon Sun at the city becomes
A.
23.5o


B.
33 o


C.
56.5 o


D.
80 o


E.
103.5 o Answer: B




Explanation:
At the Summer solstice, the noon Sun has an angle of elevation higher than the latitude by 23.5o. Hence the latitude of the city is 80o C 23.5o = 56.5o.
At the Winter solstice, the noon Sun has an angle of elevation lower than the latitude by 23.5o. Hence the angle is 56.5o C 23.5o = 33o.

(4) If people on Earth are seeing a partial lunar eclipse, then astronauts standing on Moons surface facing Earth would see only
A.
no solar eclipse.


B.
annular solar eclipse.


C.
partial solar eclipse.


D.
total solar eclipse.


E.
partial or total solar eclipse, depending on the location on Moon.

Answer: E



Explanation: During a partial lunar eclipse,













(5) You are given the following data:
Planet
Mass
Radius

Venus
0.82 ME
0.95 RE

Earth
1 ME
1 RE

Mars
0.11 ME
0.53 RE



Here ME and RE are respectively the mass and radius of Earth.
Arrange the following velocities in increasing magnitude:
X is the orbital velocity around Venus at a distance of 3 RE from the center.
Y is the escape velocity from Earth at a distance of 2RE from the center.
Z is the escape velocity from the surface of Mars.
A.
X < Y < Z


B.
Z < X < Y


C.
Y < Z < X


D.
X < Z < Y


E.
Z < Y < X Answer: D




Explanation:







(6) When a lunar eclipse occurs, where do you have to be in order to see the eclipse?
A.
Anywhere