Astronomers conclude that quasars must come from the earliest phases of the Universe because they ____
a. have supermassive black holes
b. are colliding with other galaxies
c. create jets
d. have large redshifted spectra
e. have a fluctuating luminosity
d
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Energy in Capacitors: A 5.0 ?F capacitor has a potential difference of 5.0 V applied across its plates. If the potential difference across its plates is increased to 8.0 V, how much additional energy does the capacitor store?
A. 98 ?J B. 200 ?J C. 23 ?J D. 45 ?J
A radar installation operates at 9000 MHz with an antenna (dish) that is 15 meters across. Determine the maximum distance (in kilometers) for which this system can distinguish two aircraft 100 meters apart
a. 7.4 km b. 370 km c. 3700 m d. 37 km e. 740 km
Which is the smallest?
A) The distance from the Sun to the Andromeda Galaxy B) The distance from the Sun to the Virgo cluster of galaxies C) The distance from the Sun to the center of the Milky Way Galaxy D) The Solar System. E) The distance from the Sun to its nearest neighboring star
A person with limited accommodation is prescribed lenses of power –3.0 diopters for distant vision. Bifocal inserts are added to these lenses to allow vision at 50 cm. What is the power of the inserts?
a. –1.0 diopters b. 2.0 diopters c. 5.0 diopters d. 50 diopters e. This does not work with negative diopter distance lenses.