According to the nebular hypothesis, which of the following sequences of events are chronologically correct?
A. Solar nebula, interstellar cloud, collisions between planetesimals, accretion, planets
B. interstellar cloud, Solar nebula, accretion, collisions between planetesimals, planets
C. accretion, Solar nebula, interstellar cloud, collisions between planets, planetesimals
D. interstellar cloud, accretion, Solar nebula, collisions between planetesimals, planets
Answer: B
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Satellite Motion: Find the orbital speed of an ice cube in the rings of Saturn. The mass of Saturn is 5.68 × 1026 kg, and use an orbital radius of 1.00 × 105 km. (G = 6.67 × 10-11 N ? m2/kg2)
A. 19.5 km/s B. 27.5 km/s C. 13.8 km/s D. 9.40 km/s
Which of the following is not a conserved quantity?
A) energy B) momentum C) angular momentum D) radiation
It is bright everywhere. You have been able to travel around, and it's clear that you are not inside a star. Yet your surroundings seem as bright as looking directly at the Sun
As you travel around, you notice that you cannot find a single neutral atom anywhere, nor can you find any nucleus besides those of hydrogen and helium. While it is hot (a few thousand degrees Kelvin), it is nowhere near the temperature needed for nuclear fusion. Where are you? A) You are in the planetary nebula that the Sun will form about 5 billion years from now. B) You are in an accretion disk around a supermassive black hole. C) You are in the universe more than 10100 years in the future. D) You are in the universe during its first 380,000 years. E) You are in the central regions of a quasar.
A thin film appears magenta when illuminated with white light. The color being cancelled by destructive interference is
A) red. B) green. C) white. D) blue. E) none of the above