1.0 kilometer equals ___________ nanometers.
a.
b.
c.
d.
a.
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Ekapluto is an unknown planet that has two spherical moons in circular orbits. The table summarizes the hypothetical data about the moons. Both moons have low axial spin rates. (G = 6.67 × 10-11 N ? m2/kg2)
Mass Radius Orbital radius Orbital period Moon A 4.0 × 1020 kg 2.0 × 108 m 4.0 × 106 s Moon B 1.5 × 1020 kg 2.0 × 105 m 3.0 × 108 m The acceleration due to gravity at the surface of Moon B is A) 0.10 m/s2. B) 0.15 m/s2. C) 0.20 m/s2. D) 0.25 m/s2. E) 0.30 m/s2.
The discovery of the neutron helped people understand
A. why the nucleus has a positive charge. B. how electrons are attracted to the nucleus. C. how two atoms of the same element can have different atomic masses. D. why the nucleus is much more massive than the electrons in an atom.
Which of the following statements best describes the concept of structural conformation?
A) rearranging the shape of a molecule by rotating around bonds B) rearranging the shape of a molecule by changing the arrangement of bonds C) changing the structure by adding or subtracting bonds D) arranging the atom into the best conformation for the given structure E) changing the conformation to generate a new molecule with different chemical properties
Chemical rockets work on which basic physical principle?
A) Kepler's first law of planetary motion B) Einstein's special theory of relativity C) Newton's third law of motion D) the law of conservation of energy