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 speeds of a globular clusters in the galaxy are greater than the speed of light. c. the orbital motion of material near the center is very fast and indicates a very massive core. d. the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole. e. the spiral structure requires a black hole to maintain the spiral arms.
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Which property of fossils allow scientists to determine the relative rock ages..
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Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage
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How much force was applied to an object if was moved 2 meters and the work done on the object was 8 joules? a. 0.25 n b. 4 n c. 6 n d. 16 n
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Supermassive black holes are believed to be located at the center of many galaxies because a. the ro...
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