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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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
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.
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
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.