What determines if a star becomes a white dwarf, a neutron star, or a black hole?
A) the principal factor is mass
B) the principal factor is density
C) the principal factor is temperature
D) the principal factor is luminosity
Answer: A
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If the average density of the universe is less than the critical density, the Universe is open
a. True b. False Indicate whether the statement is true or false
Angular Momentum: When is the angular momentum of a system constant?
A. Only when its total kinetic energy is constant. B. Only when no net external force acts on the system. C. Only when the linear momentum and the energy are constant. D. Only when no net external torque acts on the system. E. Only when the moment of inertia is constant.
According to the Solar Nebula theory, planets:
A) should be randomly oriented to their star's equator. B) will revolve opposite the star's rotation. C) should be a common result of star formation. D) should be extremely rare. E) should orbit perpendicular to their star's equator.
Compared with the buoyant force of the atmosphere on a helium-filled balloon, the buoyant force of the atmosphere on a nearby wood block of the same volume is
A) considerably less. B) considerably more. C) the same.