The moon with a mass of 
kg is orbiting about the earth with a mass of 
kg at a radius of 
meters. The earth is orbiting about the sun with a mass of 
kg at a radius of 
meters. The force of gravity on the moon when it is between the earth and the sun is 
A. 
N toward the sun.
B. 
N toward the earth.
C. 
N toward the sun.
D. 
N toward the earth.
E. 
N toward the earth.
C.
N toward the sun.
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The traditional theory of the formation of our galaxy cannot explain
a. the existence of the disk of the galaxy b. the fact that the oldest stars in the galaxy are not metal free. c. the spherical distribution of the globular clusters d. the difference in metal abundance of the population I and II stars. e. the existence of the nuclear bulge.
You stand on a scale to measure your weight. The reaction to the force the Earth exerts on you is
A. the force the Earth exerts on the scale. B. the force you exert on the Earth. C. the force the scale exerts on you. D. the force you exert on the scale. E. the force the scale exerts on the Earth.
The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much because
A) your mass is 100 times less on Jupiter. B) Jupiter is significantly farther from the Sun. C) Jupiter's radius is 10 times Earth's radius. D) you are 100 times more weightless there. E) none of the above
In the radiation field from an antenna, the electric and magnetic fields are
A) perpendicular to one another. B) anti-parallel to one another. C) anti-perpendicular to one another. D) parallel to one another. E) never in any geometric arrangement with respect to one another.