The force of gravity between two objects:
A) increases with the masses of the bodies, but decreases with their separations.
B) increases with the masses of the bodies, but decreases with the square of the distances between them.
C) increases with the square of their masses, but decreases with the cube of their periods of orbit about the Sun.
D) depends on the density, not the mass of the bodies.
E) depends on the temperature, density, and size of the bodies.
B
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During the time that a planet is in its period of apparent retrograde motion,
A) the planet moves backwards (clockwise as viewed from above Earth's north pole) in its orbit of the Sun. B) the planet appears to rise in the west and set in the east, rather than the usual rising in the east and setting in the west. C) over many days or weeks, the planet moves westward relative to the stars, rather than the usual eastward relative to the stars. D) the planet is getting closer to the Sun in its orbit.
Spherical Mirrors: An object that is 4.0 cm tall is placed 15 cm in front of a concave mirror of focal length 20 cm.(a) Where is the image formed and how far is it from the mirror?(b) How tall is the image?
What will be an ideal response?
Sustainable development of a finite resource is
a. never possible. b. sometimes possible. c. possible half the time. d. usually possible. e. always possible.
Which is correct?
A.) 6 flavors of quarks and 6 flavors of antiquarks. B.) 3 flavors of quarks and 3 flavors of antiquarks. C.) 6 flavors of quarks and 2 flavors of antiquarks. D.) 2 flavors of quarks and 2 flavors of antiquarks. E.) 12 flavors of quarks and antiquarks can't exist at all.