The escape velocity needed for an atom in the atmosphere of a planet to escape the gravitational pull of the planet is smaller if:
a) the radius of the planet is smaller
b) the planet is farther from the Sun
c) the mass of the atom is larger
d) the temperature of the gas in the atmosphere is lower
e) the mass of the planet is smaller
Ans: e) the mass of the planet is smaller
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In the inductor of a 59-Hz AC series circuit, the peak voltage precedes the peak current in each cycle by what time interval?
a. 1.7E–2 s b. 4.2E–3 s c. 8.5E–3 s d. 3.4E–2 s e. 6.8E–2 s
The halo in the spherical component of the Milky Way contains about _____ as many stars as the disk of the galaxy
A) 2 percent B) 6 percent C) 10 percent D) 14 percent
If the terrestrial planets were formed by homogeneous accretion, then
a. they were initially molten forming an iron core first, then they accreted a silicate crust later. b. they were initially molten forming a silicate core first, then they accreted an iron crust later. c. they were initially collections of solid particles which melted then differentiated into a high-density iron metal core and low-density silicate crust. d. they were initially collections of solid particles which melted then differentiated into a high-density silicate core and low-density iron metal crust.
The three lowest resonate frequencies of a system are 50 Hz, 150 Hz, and 250 Hz. The system could be
A. a tube of air closed at both ends. B. a tube of air open at one end. C. a tube of air open at both ends. D. a vibrating string with fixed ends.