What types of stars end their lives with supernovae?
A) all stars that are red in color
B) all stars that are yellow in color
C) high-mass stars that can continue to have core fusion until they have iron cores
D) stars that are similar in mass to the Sun
E) stars that have reached an age of 10 billion years
C) high-mass stars that can continue to have core fusion until they have iron cores
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What fraction of the mass needed to halt expansion is known to exist in the form of visible mass in the universe?
A) 1 percent B) 4 percent C) 22 percent D) 74 percent E) 100 percent
What evidence leads scientists to conclude that life was present on Earth within a billion years of its formation?
A) Such early existence of life is the only way to explain the variety of life-forms seen today. B) Fossil evidence of life dates back to this time. C) Studies of DNA indicate that life must have been present by that time.
What is the magnitude of the magnetic field at point P in the figure if a = 2.0 cm, b = 4.5 cm, and I = 5.0 A?
A. 87 ?T, into the paper B. 87 ?T, out of the paper C. 0.23 mT, out of the paper D. 0.23 mT, into the paper E. 23 ?T, into the paper
In an adiabatic compression, 200 J of work is done on a gas. What is the change in internal (thermal) energy of the gas during this compression?
A) 0 J B) 100 J C) 200 J D) -200 J