The largest known black holes
A) can be no bigger than a small city, just like neutron stars.
B) can be no bigger than the Earth, like white dwarfs.
C) lie in the cores of the most massive galaxies.
D) create the dark nebulae in the plane of the Milky Way.
E) can be no more than 1.4 solar masses, according to Chandrasekhar.
C
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Semiconductor elements are "doped" in order to
A. make them less susceptible to temperature changes. B. make them electrically charged. C. eliminate the possibility of incomplete bonds. D. increase their electrical conductivity.
According to the kinetic theory of gases, the molecules in the air in a particular room must have some kinetic energy which depends on the temperature in the room. In order to extract this energy to do mechanical work I would need for the object receiving this energy to be at a much colder temperature. This is best explained by
A. the Second Law of Thermodynamics. B. Newton's laws of motion. C. the law of gravity. D. conservation of energy.
A cylinder with its mass concentrated toward the center has a moment of inertia of 0.2MR2 . If this cylinder is rolling without slipping along a level surface with a linear speed v, what is the ratio of its rotational kinetic energy to its linear kinetic energy?
a. 1/l0 c. 1/2 b. 1/5 d. 1/1
How long is the precession cycle?
A) 1 day B) 29.5 days C) 365.24 days D) 18 years, 11.3 days E) 26,000 years