A planetary nebula is a(n) ____
a. expanding envelope of ionized gas expelled by a dying medium-mass star
b. expanding envelope of neutral gas and dust expelled by a dying medium-mass star
c. contracting envelope of dusty material from planets destroyed by a dying medium-mass star
d. contracting envelope of ionized interstellar medium absorbed by a dying medium-mass star
e. expanding atmosphere of a medium-mass star as it becomes a red giant
a
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Which of the following is(are) found mainly between Mars and Jupiter?
a. Asteroids b. Meteoroids c. Comets d. Interplanetary dust
Which of these is the ideal gas law that relates the temperature T, pressure P, and volume V of n moles of ideal gas consisting of N molecules?
a. PV = nRT b. P = nRTV c. PVn = RT d. P = VRT e. PV = NRT
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 reasons) to appear in your home town?
A) The entire Earth would end up as a thin layer, about 1 cm thick, over the surface of the neutron star. B) It would rapidly sink to the center of Earth. C) The combined mass of Earth and the neutron star would cause the neutron star to collapse into a black hole. D) It would crash into Earth, throwing vast amounts of dust into the atmosphere that, in turn, would cool Earth; this is probably what caused the extinction of the dinosaurs.
A uniform 1.5-T magnetic field passes perpendicularly through the plane of a wire loop 0.30 m2 in area. What flux passes through the loop?
a. 0.135 T×m2 c. 0.45 T×m2 b. 5.0 T×m2 d. 0.25 T×m2