Despite its thick cloud cover, astronomers can observe the surface of Venus with
A. ultraviolet light.
B. visible light.
C. infrared light.
D. radar.
Answer: D
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Buoyancy: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the buoyant force B on this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
A spaceship leaves Earth and maintains a constant force by means of a nuclear engine. As the speed of the spaceship increases, an observer on Earth finds that relative to her the magnitude of the spaceship's acceleration is
A. 0. B. decreasing. C. constant. D. increasing. E. proportional to the kinetic energy of the spaceship.
In an RC circuit, what fraction of the final energy is stored in an initially uncharged capacitor after it has been charging for 3.0 time constants?
a. 0.84 b. 0.90 c. 0.75 d. 0.60 e. 0.03
What happened to the quarks that existed freely during the particle era?
A) They combined in groups to make protons, neutrons, and their antiparticles. B) They froze out of the soup of particles at the end of the era. C) They evaporated. D) They combined in groups to make electrons and neutrinos. E) They combined in groups to make W and Z bosons.