All old surfaces in the solar system were heavily cratered during the ________________ period by leftover debris from when the planets formed
Fill in the blank(s) with correct word
heavy bombardment
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Which planetary fact(s) is(are) explained by the solar nebula theory?
a. The orbits are all approximately in the same plane b. The orbits are all in the same direction c. Jovian planets are mostly H and He d. Terrestrial planets are mostly rock and iron e. All of the other choices are correct.
In Bohr's model of the atom, electrons
A) only make transitions between orbitals of specific energies. B) are not confined to specific orbits. C) are spread uniformly through a large, positive mass. D) can be halfway between orbits. E) move from orbit to orbit in many small steps.
Equilibrium: As shown in the figure, a uniform rectangular crate 0.40 m wide and 1.0 m tall sits on a horizontal surface. The crate weighs 460 N, and its center of gravity is at its geometric center. A horizontal force of magnitude F is applied at a distance h above the floor. Friction at the floor is great enough to prevent the crate from sliding. If h = 0.69 m, what minimum value of F is required to make the crate start to tip over?
Fill in the blank(s) with the appropriate word(s).
The moons of Uranus have been named after ____
a. Roman gods b. Greek goddesses c. characters of Shakespearean plays d. characters of Tennessee Williams' plays e. the Romanoff family children's names