Suppose you live at latitude 30°S. Which star is circumpolar in your sky?
Consider the following data for four stars:
Star RA Dec.
Spica 13hr24m.1 -11°20'
Deneb 20hr39m.7 +45°06'
Sirius 6hr44m.2 -16°42'
Alpha Centauri 14hr38m.4 -60°46'
A) Alpha Centauri
B) Deneb
C) Spica
D) Sirius
A) Alpha Centauri
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What is the cause for the slow movement of reference marks, such as the celestial poles and equator, to move across the sky?
a. precession b. evolution c. climate change d. continental drift e. angular revolution
Which clock measures a coordinate time between the synchronization and comparison events?
A. Clock A B. Clock B C. Both D. Neither
A long cylinder (radius = 3.0 cm) is filled with a nonconducting material which carries a uniform charge density of 1.3 ?C/m3. Determine the electric flux through a spherical surface (radius = 2.0 cm) which has a point on the axis of the cylinder as its center.
A. 5.7 N ? m2/C B. 4.9 N ? m2/C C. 6.4 N ? m2/C D. 7.2 N ? m2/C E. 15 N ? m2/C
If beam 1 is the incoming beam in the figure below, which of the other four beams are due to reflection?