A lens that is thicker at the center than at the edge is
a. a diverging lens only.
b. a convex lens only.
c. a converging lens only.
d. both a convex lens and a converging lens.
d
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Standing Waves on a String: A 4.0-g string is 0.36 m long and is under tension. The string vibrates at 500 Hz in its third harmonic. What is the wavelength of the standing wave in the string?
A. 0.24 m B. 0.36 m C. 0.54 m D. 0.72 m E. 0.90 m
Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4-solar-mass limit?
A) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit. B) White dwarfs get hotter with increasing mass, and above the 1.4-solar-mass limit they would be so hot that even their electrons would melt. C) White dwarfs are made only from stars that have masses less than the 1.4-solar-mass limit. D) The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists.
An astronaut of mass 70 kg weighs 700 N on Earth's surface. His weight on the surface of Mars, where the acceleration due to gravity is 3.7 m/s2, would be about
A) the same as on Earth. B) 130 N. C) 260 N. D) 370 N. E) none of the above
On some early automobiles both headlights failed when one bulb burned out. The headlights were likely connected in
A) parallel. B) perpendicular. C) series. D) haste.