How does a black hole form from a massive star?
A) During a supernova, if a star is massive enough for its gravity to overcome neutron degeneracy pressure in the core, the core will collapse to a black hole.
B) Any star that is more massive than 8 solar masses will undergo a supernova explosion and leave behind a black hole remnant.
C) If enough mass is accreted by a white dwarf star that it exceeds the 1.4 solar mass limit, it will undergo a supernova explosion and leave behind a black-hole remnant.
D) A black hole forms when two massive main-sequence stars collide.
E) If enough mass is accreted by a neutron star, it will undergo a supernova explosion and leave behind a black-hole remnant.
A
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Dark energy
A) has mass. B) has never been directly observed in the laboratory. C) pushes on space. D) All of the above. E) None of the above.
A 8.4-kg mass is placed at (3.0, 4.0) m. Where can a 4.2-kg mass be placed so that the moment of inertia about the z axis is zero?
a. (-3.0, -4.0) m c. (-1.5, -2.0) m b. (-6.0, -8.0) m d. There is no position giving this result.
During a single period, the distance traveled by a wave is
A) one-half wavelength. B) one wavelength. C) two wavelengths. D) more information is needed
Rising air expands and cools. The rate of cooling depends on
A) the air's moisture content. B) the dry adiabatic lapse rate. C) the energy of the water-vapor molecules. D) temperature inversions.