It was the distribution of ________ that showed Harlow Shapley we were nowhere near the center of the Milky Way early in the 20th century
A) planetary nebulae
B) emission nebulae
C) open clusters
D) globular clusters
E) supernova remnants
D
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A 3.000 kg ball is pitched with a kinetic energy of 20.00 Joules. Then the momentum of the ball is
A. 7.500 kg m/s. B. 8.350 kg m/s. C. 9.450 kg m/s. D. 10.95 kg m/s. E. 12.50 kg m/s.
Which statement most accurately describes the relationship between the largest and smallest planets?
A) The largest planet is 6000 times as wide (in diameter) and 30 times as massive as the smallest. B) The largest planet is 6000 times as wide (in diameter) and 6000 times as massive as the smallest. C) The largest planet is 30 times as wide (in diameter) and 30 times as massive as the smallest. D) The largest planet is 30 times as wide (in diameter) and 6000 times as massive as the smallest.
The device that spreads light into its component colors in a spectroscope is a
A) prism. B) diffraction grating. C) either of these D) neither of these
A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, -Q, is placed at x = 3.0 m. If Q = 40 mC, what is the magnitude of the electrostatic force on a 30-mC charge placed at the origin?
a. 7.2 N b. 3.9 N c. 1.5 N d. 14 N e. 8.1 N