When a planet's orbit takes it closest to the Sun, it's called
A) vernal equinox.
B) perihelion.
C) aphelion.
D) crossing the ecliptic.
E) none of the above; a planet's distance from the Sun never changes.
B
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Most spiral galaxies have rotation curves that
A) decrease rapidly with increasing radius in the disk, indicating no dark matter is present. B) increase drastically with increasing radius. C) decrease rapidly with increasing radius in the disk, indicating the presence of dark matter. D) stay constant out to large radii in the disk, indicating that no dark matter is present. E) stay constant out to large radii in the disk, indicating the presence of dark matter.
Self-Inductance: What is the self-inductance of an ideal solenoid that is 300 cm long with a cross-sectional area of 1.00 × 10-4 m2 and has 1000 turns of wire? (?0 = 4? × 10-7 T ? m/A)
A. 4.19 nH B. 4.19 pH C. 4.19 ?H D. 41.9 nH E. 41.9 µH
Mercury's most unusual orbital feature, as compared to the other planets, is:
A) the size of its orbit. B) the shape of its orbit. C) its orbital period. D) the size of the planet. E) that it has no moons.
If you carry a heavy bag of groceries and bang your hand against the wall, the concept that best explains why your hand hurts is
A) inertia. B) gravity. C) resistance. D) none of the above