The smallest major planet in the solar system lacks
a. a surface.
b. a solid surface.
c. a moon.
d. a gravitational field.
c
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What is an accretion disk?
A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole B) any flattened disk in space, such as the disk of the Milky Way Galaxy C) a stream of gas flowing from one star to its binary companion star D) a disk of material found around every white dwarf in the Milky Way Galaxy
You would expect millisecond pulsars to be:
A) part of a binary system. B) isolated in space. C) rotating slowly. D) most common in open clusters. E) collapsing rapidly.
A stonecutter's chisel has an edge area of 0.7 cm2 . If the chisel is struck with a force of 42 N, what is the pressure exerted on the stone?
a. 600 N/m2 b. 30 000 N/m2 c. 300 000 N/m2 d. 600 000 N/m2 e. 6 000 N/m2
The percentage composition by mass of nitrogen dioxide is approximately
a. 43% N and 57% O. b. 33% N and 67% O. c. 30% N and 70% O. d. 47% N and 53% O.