From what do stars form?
A. black holes
B. interstellar clouds
C. open clusters
D. planetary nebulas
E. globular clusters
Answer: B
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A silicon monoxide (n = 1.45) film of 112-nm thickness is used to coat a glass camera lens (n = 1.56). What wavelength of light in the visible region (390 to 710 nm) will be most efficiently transmitted by this system? (1 nm = 10?9 m)
a. 520 nm b. 768 nm c. 715 nm d. 650 nm e. 455 nm
A river's suspended load and bed load may accumulate at its mouth and form a(n)
a. delta. b. flood plain. c. moraine. d. abyssal plain.
A disk, a hoop, and a solid sphere are released at the same time at the top of an inclined plane. They all roll without slipping. In what order do they reach the bottom?
A) disk, hoop, sphere B) hoop, sphere, disk C) sphere, disk, hoop D) hoop, sphere, disk E) hoop, disk, sphere
If you rub two transparency sheets with tissue and then hold the two transparency sheets at rest a short distance apart, the electromagnetic forces they exert on each other will be
A) magnetic but not electric. B) electric but not magnetic. C) zero. D) both electric and magnetic.