If the kinetic energy of a ball is doubled, then the momentum is
A. 0.50 times larger.
B. 0.71 times larger.
C. 1.00 times larger.
D. 1.41 times larger.
E. 1.50 times larger.
D. 1.41 times larger.
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The period-luminosity relation is useful in determining
a. the mass of a star for which the distance is known. b. the temperature of a star for which we know the luminosity. c. the radius of the bulge of our galaxy. d. the distance to globular clusters that contain Cepheid variables. e. the mass of the Milky Way galaxy.
Evidence that tidal interactions and collisions of galaxies may make ordinary galaxies active is that
a. many active galaxies are distorted. b. some active galaxies have companions. c. many active galaxies are distorted and some active galaxies have companions. d. active galaxies are neither distorted nor have companions.
Astronauts, in satellites orbiting Earth, feel weightless. Are they really weightless?
A) Yes, because the centrifugal force due to their circular motion balances the force of gravity. B) Yes, because they are not in Earth's gravitational field. C) Yes, because they are "falling" around Earth. D) No, because the gravitational force is pulling downward on them. E) No, because the centrifugal force is pulling outward on them.
Charge of uniform surface density (0.20 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2.0 m
a. 17 N/C b. 11 N/C c. 23 N/C d. 28 N/C e. 40 N/C