On the celestial sphere, the Sun
A) circles once each year along the path called the ecliptic.
B) stays always at the same fixed point among the stars.
C) circles daily around the celestial equator.
D) is the central object.
A) circles once each year along the path called the ecliptic.
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One member of a pair of parallel conducting plates has potential 17 V. An electron is ejected from that plate at potential and travels the other plate, attaining a velocity of 
when it arrives. What is the potential of the second plate? The mass of the electron is 
kg.
A. 157 V B. 89 V C. 72 V D. -54 V E. 142 V
In each of the following situations, point charge q moves in a uniform magnetic field B. The strength of the magnetic field is indicated by the density of field lines. In each situation, the initial speed v of the charge is the same. For which situation(s) will the charge q travel the longest distance in a certain time T?
1.1
2.2
3.3
4.4
5.5
6.1 & 3
7.2 & 4
8.1, 2, 3 & 4
9.1, 2, 3, 4 & 5
10.Cannot be determined
During precipitation-hardening, at peak strength the precipitate changes from coherent to _________.
Fill in the blank(s) with the appropriate word(s).
In which layer of Earth's atmosphere is ultraviolet light absorbed?
A) exosphere B) thermosphere C) stratosphere D) troposphere