Which of the following is true of meteors?
A) They are not stars.
B) They orbit Terrestrial planets.
C) They are composed of frozen water.
D) They do not contain rock or metal.
A
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Light of wavelength 600 nm in air goes into a medium where the index of refraction is 1.73. What is the frequency of this light in the medium?
A. 
B. 
C. 
D. 
E. 
The first eukarya appeared
A) 4.6 billion years ago B) around 3.5 billion years ago C) 4.0 billion years ago D) at least 2.1 billion years ago or perhaps even earlier
A pole-vaulter holds out a 5.5kg, 4.75m pole horizontally in front of him. Assuming the pole is uniform in construction, and that he holds the pole with one hand at the very end, and one hand 0.75m from the end, what is the torque applied by the Earth to the pole?
A. 40N B. 88N C. Not enough information is given D. 128N
The first structures in the universe appear to have formed within
A) the newly formed helium. B) the normal matter. C) the electromagnetic radiation. D) the dark matter. E) the dark energy.