Soon after discovery, it was observed that quasars had a starlike appearance which was blurred by Earth's atmospheric "seeing". Despite the blurring, it was realized that the intense energy-emitting regions of quasars must be small because they
a. have high radial velocities.
b. are very luminous.
c. are surrounded by quasar fuzz.
d. radiate huge amounts of energy.
e. fluctuate rapidly on time scales as short as a few hours.
e
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The diameter of a 12-gauge copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A
At this current, what is the drift velocity of the electrons? The number of electron carriers in 1.0 cm3 of copper is 8.5 × 1022 and e = 1.60 × 10-19 C. A) 0.044 mm/s B) 0.44 mm/s C) 0.44 cm/s D) 0.44 m/s E) 4.4 cm/s
The mass of a sulfur atom is 32.0 u, and the mass of a fluorine atom is 19.0 u. What is the mass of a mole of sulfur hexafluoride (UF6)?
a. 41.0 g b. 20.5 g c. 106 g d. 146 g e. 211 g
The largest satellites of Jupiter are known as the ____________________ satellites
Fill in the blank(s) with correct word
Compared to the average size of a hydrogen atom, the average size of a helium atom is
A) larger. B) smaller. C) about the same.