Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?
A) Supermassive black holes existed only when the universe was young, and no longer exist today.
B) Active galactic nuclei can form only at large distances from the Milky Way.
C) Active galactic nuclei exist tend to become less active as they age.
D) The jets seen in many active galactic nuclei must cause them to move far away from us.
C
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Which of the following statements are true for the Bohr model of the atom? (There could be more than one correct choice.)
A) The spacing between all the electron shells is the same. B) The energy difference between all the electron shells is the same. C) As we look at higher and higher electron shells, they get closer and closer together, but the difference in energy between them gets greater and greater. D) As we look at higher and higher electron shells, they get farther and farther apart, but the difference in energy between them gets smaller and smaller. E) There is no general pattern in the spacing of the shells or their energy differences.
A boy and a girl are riding a merry-go-round which is turning at a constant rate. The boy is near the outer edge, while the girl is closer to the center. Who has the greater tangential acceleration?
A) the boy B) the girl C) Both have the same non-zero tangential acceleration. D) Both have zero tangential acceleration. E) There is not enough information given to answer the question.
A bimetallic strip is usable as a thermometer because of the property of __________
Fill in the blank(s) with correct word
What total energy is stored in the group of capacitors shown if the potential difference Vab is equal to 50 V?
A. 48 mJ B. 27 mJ C. 37 mJ D. 19 mJ E. 10 mJ