The allowed shapes for the orbits of objects responding only to the force of gravity are
A) ellipses, parabolas, and hyperbolas.
B) ellipses only.
C) ellipses, spirals, and parabolas.
D) circles and ellipses.
Question 2
In the heliocentric (Sun-centered) model, apparent retrograde motion is due to
A) relative motion between the Earth and another planet in its orbit
B) the Earth reversing the direction of its orbit about the Sun
C) a planet moving in a small circle, the center of which moves in a larger circle about the Earth
D) a planet reversing the direction of its orbit about the Sun
Gravity field of the Moon
Effect of a Black Hole’s Tidal Force on Infalling Matter
When young infants hold objects for a long period of time they eventually become habituated to them.
Specific Gravity of Selected Materials
Question about Resultant of gravitational force?
Gravity, statoliths, and auxin.