Electrons
a)have a positive charge.
b)have a mass greater than a proton.
c)possess a negative electric charge.
d)have the same mass as a proton.
c
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Which of the following indicates the presence of high-mass stars in a region of recent star formation?
A) closely spaced low-mass stars B) ionization nebulae C) globular clusters D) planetary nebulae
A series LR circuit dissipates 60 W. The circuit is powered by a 120 V rms 60 Hz supply. If the current is 2.0 A rms, what is the circuit resistance?
A. 50
B. 60
C. 15
D. 10
E. 24
If you are in the Moon's umbral shadow, then you will witness:
A) nighttime. B) a total solar eclipse. C) a total lunar eclipse. D) a partial solar eclipse. E) some kind of lunar eclipse.
What is so unique about the mirrors of telescopes such as the Keck Observatory, Gran Telescopio Canaries and the soon-to-be-built Giant Magellan Telescope? a. The mirrors are made of a newly designed metallic material. b. The mirrors can fold up went not in use
c. The mirrors are inexpensive. d. The mirrors are segmented. e. The mirrors are thin.