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

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science