White dwarf supernovae are good standard candles for distance measurements because
A) all white dwarf supernovae have about the same peak luminosity.
B) all white dwarf supernovae occurred at about the same time in the history of the universe.
C) all galaxies have at least one white dwarf supernova each year.
D) white dwarf supernovae occur only among very massive stars.
E) all white dwarf supernovae start out bright and fade with time.
A) all white dwarf supernovae have about the same peak luminosity.
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If it were not for the greenhouse effect on Earth,
a. there would be no liquid water on Earth. b. life as we know it would not have developed on Earth. c. it would be a much colder planet. d. there would be no oxygen in Earth's atmosphere. e. All of the above are results of the greenhouse effect.
How will the Sun end its life?
A) as a white dwarf B) as a white dwarf supernova C) as a massive star supernova D) as a neutron star or black hole
A long solenoid produces a field at its center. An identical solenoid is placed end to end with the first (common axis). The magnetic field at the center of the 1st solenoid is now
A) zero. B) the same. C) double. D) four times the original magnitude. E) half what it was.
The sum of the forces exerted on an object of interest is 125 N. As a result, the object accelerates with an acceleration of 24.0 m/s2. The mass of the object is
A) 3000 kg. B) 2880 kg. C) 144 kg. D) 0.200 kg. E) 5.21 kg.