Which of the following is evidence for supermassive black holes in active galaxies?
A) the discovery of powerful jets coming from a compact core
B) rapid changes in the luminosity of the galaxy nucleus
C) quasars emit approximately equal power at all wavelengths from infrared to gamma rays
D) very high speed orbital motions around galactic nuclei
E) all of the above
E
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Which of these Galilean satellites is most geologically active?
a. Io b. Europa c. Callisto d. Ganymede
Strictly speaking, to say that an apple is red means that
A) an apple is red. B) it appears red. C) is, or appears makes no difference–red is red.
How large a force is required to accelerate a 1600 kg car from rest to a speed of 25 m/s in a distance of 200 m?
A) 1600 N B) 0 N C) 200 N D) 400 N E) 2500 N
Radiometric dating is based on
A) decay of uranium-238 to lead-206. B) sequence of rocks and the relative position of one layer to another. C) proportions of radioactive isotopes and their decay products. D) the half-life of radioactive atoms.