In a situation where an object can move only along the x axis, a book states “the force on the object is F = -kx, where k is a constant, and x is the object’s position coordinate.” Is F being used here as a shorthand symbol for 
(A) or Fx (C)?
A. A
B. C
B. C
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Energy Levels: The longest wavelength photon that can be emitted by a hydrogen atom, for which the final state is n = 9, is closest to which one of the following values? (c = 3.0 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 39,000 nm B. 22,000 nm C. 7400 nm D. 16,000 nm E. 28,000 nm
Each of the following lists two facts. Which pair of facts can be used with Newton's version of Kepler's third law to determine the mass of the Sun?
A) Earth is 150 million km from the Sun and orbits the Sun in one year. B) Mercury is 0.387 AU from the Sun and Earth is 1 AU from the Sun. C) The mass of Earth is 6 × 1024 kg and Earth orbits the Sun in one year. D) Earth rotates in one day and orbits the Sun in one year.
The order of evolutionary stages of a star like the Sun would be Main Sequence, giant, planetary nebula, and finally
A) hypernova. B) neutron star. C) white dwarf. D) nova. E) black hole.
The speed of light in a certain medium is 2.2 x 108 m/s. What is the index of refraction of this medium?
A) 1.0 B) 1.2 C) 1.4 D) 1.6 E) 1.8