If a galaxy is found receding from us at 894 km/sec and it is located at a distance of 12 Mpc, what is the age of the universe if the universe is flat?
a. about 20 billion years
b. about 1.3 billion years
c. about 13 billion years
d. about 9 billion years
e. about 90 billion years
D
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What kind of planets are most easily detected using the Doppler method?
A) high mass planets far from their host star B) low mass planets far from their host star C) low mass planets close to their host star D) high mass planets close to their host star E) planets that have been ejected from their systems
What is the approximate latitude of the observer in the diagram below if they are located in the hemisphere containing the north celestial pole?
?
a.
90° N
b.
90° S
c.
50° N
d.
50° S
e.
0°
The Sun is at one focus of the elliptical orbit of the Earth aroundthe Sun. What is atthe other focus?
a) Nothing. b) The Earth. c) Mars. d) The Moon. e) Jupiter.
Spherical Mirrors: A person's face is 30 cm in front of a concave spherical shaving mirror. If the image is an erect image that is 1.5 times as large as the object, what is the focal length mirror?
A. 20 cm B. 50 cm C. 70 cm D. 90 cm