Which of the following best describes what would happen if a 1.5-solar-mass neutron star, with a diameter of a few kilometers, were suddenly (for unexplained reason) to appear in your home town?
A) The combined mass of Earth and the neutron star would cause the neutron star to collapse into a black hole.
B) It would rapidly sink to the center of Earth.
C) The entire Earth would end up as a thin layer, about 1 cm thick, over the surface of the neutron star.
D) It would crash into Earth, throwing vast amounts of dust into the atmosphere that, in turn, would cool the Earth; this is probably what caused the extinction of the dinosaurs.
C
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What do we mean by a protogalactic cloud?
A) a cloud of hydrogen and helium that contracts to become a galaxy B) a term once used historically to refer to any galaxy C) the cloud-like halo that surrounds the disks of spiral galaxies D) a cloud of gas that was once a galaxy
Which of these, if used to replace gasoline as an automobile fuel, would not contribute to global warming?
A) Synthetic gasoline made from coal B) Electricity from a nuclear power plant C) Electricity from a coal-burning plant D) All of the above would contribute to global warming. E) None of the above would contribute to global warming.
A single circular (radius = R) loop of wire is located in the yz plane with its center at the origin. The loop has a clockwise current as seen from the point (+R, 0, 0). The direction of the magnetic field at the point
a. (0, 0, 0) is ?i and at the point (+R, 0, 0) is ?i. b. (0, 0, 0) is ?i and at the point (0, +2R, 0) is ?i. c. (0, 0, 0) is +i and at the point (+R, 0, 0) is +i. d. (0, 0, 0) is +i and at the point (0, +2R, 0) is +i. e. None of the above
Can the lines in the figure below be equipotential lines?
a.
No, because there are sharp corners.
b.
No, because they are isolated lines.
c.
Yes, because any lines within a charge distribution are equipotential lines.
d.
Yes, they might be boundary lines of the two surfaces of a conductor.
e.
It is not possible to say without further information.