According to the supermassive black hole hypothesis, how is the energy that powers active galactic nuclei produced?
A) by nuclear fusion near the central black hole
B) by magnetic fields that trap and accelerate charged particles
C) by the impact of jets being shot out of the central black hole
D) by converting the gravitational potential energy of infalling matter to kinetic energy and thermal energy
E) by matter—antimatter annihilation
D) by converting the gravitational potential energy of infalling matter to kinetic energy and thermal energy
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What elements are in the supernova remnant?
A.) Oxygen. B.) Sulfur. C.) Hydrogen. D.) Nitrogen. E.) All of the above.
Your image in a plane mirror is
A) virtual. B) real. C) both of these D) neither of these
The apparent weight of a fish in an elevator is greatest when the elevator
A. moves downward at constant velocity. B. moves upward at constant velocity. C. accelerates downward. D. accelerates upward. E. is not moving.
The Earth's magnetic field is attributed to the
A) flow of molten liquid in Earth's inner core. B) flow of molten fluid in Earth's outer core. C) movement of lithospheric plates in the outer mantle. D) movement of lithospheric plates at Earth's surface.