The celestial equator is
a. a line around the sky directly above Earth's equator.
b. the dividing line between the north and south celestial hemispheres.
c. the path that the sun appears to follow on the celestial sphere as Earth orbits the sun.
d. a and b.
e. a and c.
D
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An empty spice bottle has an inner volume of 1.31 × 10^?4 m3 . It has a mass of 112 g when filled with air, and it displaces 1.63 × 10^?4 m3 of water when fully submerged. What volume of mercury (?Hg = 13.6 × 10^3 kg/m3) must be added to the empty bottle so that it will just submerge?
a. 3.75 cm3 b. 12.0 cm3 c. 101 cm3 d. 147 cm3 e. 237 cm3
A nova is a new star
a. True b. False Indicate whether the statement is true or false
Semiconductors: When a voltage is applied across a p-type semiconductor, the holes
A. are destroyed. B. move toward the positive electrode. C. move toward the negative electrode. D. do not move.
Which of the following expressions is correct for the transmitted intensity of an unpolarized beam of light with an intensity Ii passing through a polarizer?
A) It = Ii B) It = (1/2 ) Ii C) It = (1/4 ) Ii D) It = 2 Ii E) It = 4 Ii