Supermassive black holes are believed to be located at the center of many galaxies because
a. the rotation curve of the galaxy indicates that 90% of the galaxy is dark matter.
b. the orbital motion of material near the center is very fast and indicates a very massive core.
c. the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole.
d. the spiral structure requires a black hole to maintain the spiral arms.
e. the orbital speeds of a globular clusters in the galaxy are greater than the speed of light.
b
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While you are standing in the aisle of a bus, the driver suddenly makes a left turn. You lurch to the right due to
A) an unbalanced force. B) your tendency to keep moving forward. C) an equilibrium challenge.
In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the
A) top left. B) top right. C) middle of the main sequence. D) top center. E) bottom left.
Baryon number is conserved in all interactions
a. True b. False Indicate whether the statement is true or false
The number of significant figures in 10001 is
A) two. B) three. C) five. D) six.