A star with a large parallax:
A) is at a great distance from Earth.
B) is moving at a great speed with respect to Earth.
C) is at a short distance from Earth.
D) is moving at a slow speed with respect to Earth.
E) is not moving with respect to Earth.
C
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An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
A sealed container holds 0.020 moles of nitrogen (N2) gas at a pressure of 1.5 atmospheres and a temperature of 290 K. The atomic mass of nitrogen is 14 g/mol
The Boltzmann constant is 1.38 × 10-23 J/K and the ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K. The average translational kinetic energy of a nitrogen molecule is closest to A) 4.0 × 10-21 J. B) 6.0 × 10-21 J. C) 8.0 × 10-21 J. D) 10 × 10-21 J. E) 12 × 10-21 J.
An object drops a distance h in a time of 6.3 s on the surface of the earth (neglecting air effects)
How long would it take the same object to drop the same distance on the surface of spherical asteroid X having a mass of 1.1 × 1022 kg and a radius of 4.0 × 105 m? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m) A) 9.2 s B) 6.3 s C) 5.2 s D) 12 s E) 3.3 s
What is needed, in addition to the parts of the Bohr model used to calculate the energies of a hydrogen atom, to understand the periodicity of the elements?
a. An understanding of the photoelectric effect. b. The calculated radii of the orbits in which electrons move. c. The principle that alkali metals (in the column of the Periodic Table containing lithium, sodium, potassium, etc.) have their outer shell of electrons filled. d. The principle that atoms have shells that each hold a certain number of electrons, with filled shells being the most stable. e. The principle that the noble gas elements accept electrons easily from other atoms.