Which experiences the least electrical force in an electric field?
A) alpha particle
B) beta particle
C) electron
D) gamma ray
E) all the same
Answer: D
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Ekapluto is an unknown planet that has two moons in circular orbits. The table summarizes the hypothetical data about the moons. (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 mass of Ekapluto is closest to A) 1.0 × 1022 kg. B) 3.0 × 1022 kg. C) 1.0 × 1023 kg. D) 3.0 × 1023 kg. E) 1.0 × 1024 kg.
So far, beyond the solar system the exoplanets found have been mostly:
A) large jovians orbiting solar-type stars about where our jovians are found. B) large jovians with terrestrial-type orbits. C) terrestrials very close to their star, and transiting its disk. D) terrestrials with very elongated, distant orbits like comets. E) brown dwarfs much more massive than Jupiter.
The presence of elements heavier than helium in stars is very important because
A) they provide the raw materials for the formation of planets and life B) without them they could not form C) they help stabilize their interiors D) they are responsible for the fusion reactions at their centers
The switch in the figure is closed at t = 0 when the current I is zero. When I = 15 mA, what is the potential difference across the inductor?
A. 240 V B. 60 V C. 0 D. 180 V E. 190 V