The radioactive ages of the moon rocks show that the Moon's surface solidified about _____
A) 2.5 billion years ago
B) 3.4 billion years ago
C) 4.4 billion years ago
D) 5.5 billion years ago
C
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________ occur(s) because photons we receive from the edge of the solar disk are emitted further from the base of the photosphere than the photons we receive from the center of the solar disk
a. The Zeeman Effect b. Sunspots c. Solar flares d. Solar prominences e. Limb darkening
Tycho's supernova was of Type Ia. What happened to the companion star when the white
A. It turned into a black hole. B. It went zooming away at the velocity it had from its orbit. C. It immediately exploded as well. D. It merged with the white dwarf that went supernova. E. It turned into a neutron star.
One-third as much net force is exerted on object A as on object B. The two objects have the same mass. How do their accelerations compare?
A) Object A has one-sixth as much acceleration as object B. B) Object A has three times as much acceleration as object B. C) Object A has one-third as much acceleration as object B. D) They both have the same acceleration. E) It is impossible to answer this without further information about the two objects.
If the instantaneous velocity of an object is constant, then so is its
a. velocity. b. distance. c. acceleration. d. displacement.