What is the most likely reason that there are no other jovian planets in our solar system beyond Neptune?
A) Any planets forming beyond Neptune would have drifted out of the solar system due to the weakness of the Sun's gravity at this distance.
B) There was no material to create planetesimals beyond the orbit of Neptune.
C) By the time planetesimals grew to a large enough mass to capture hydrogen and helium gas from the solar nebula, the gas had been cleared by the solar wind.
D) Any planet forming beyond Neptune's orbit would have been scattered outside of the solar system by gravitational encounters.
E) Formation of another planet was prevented by orbital resonances with Neptune.
C) By the time planetesimals grew to a large enough mass to capture hydrogen and helium gas from the solar nebula, the gas had been cleared by the solar wind.
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A nearsighted person wears contact lenses of refractive power -6.0 D. What is his near point?
A. 6.0 cm B. -6.0 cm C. 17 cm D. -17 cm E. -4.0 cm
The ________ a period ________, that coincides with ________.
A. magnetic cycle is; of 22 years; a period of intense solar and earthquakes B. sunspot cycle is; of 11 years; the Sun's rotation around its axis C. Maunder Minimum is; of low sunspot activity; the "little ice age" in the late 17th century D. solar cycle is; of high sunspot activity; the cycle of the planetary alignments
A helium-neon laser (? = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5°, what is the line spacing, d?
a. 1.81 × 10^?6 m b. 1.00 × 10^?5 m c. 1.00 × 10^?4 m d. 1.31 × 10^?6 m e. 6.76 × 10^?7 m
Consider again the civilization described in the previous question. (They live on a planet orbiting 10 AU from a close binary star system that consists of a 15 MSun red giant star and a 10 MSun black hole surrounded by an accretion disk
) One foolhardy day, a daring individual in their space force (let's call him Major Tom) decides to become the first of his species to cross the event horizon of the black hole. To add to the drama, he decides to go in wearing only a thin space suit, which offers no shielding against radiation, no cushioning against any forces, and so on. Which of the following is most likely to kill him first (or at least to start the process of killing him first)? A) tidal forces due to the black hole B) the crush of gravity at the singularity embedded within the black hole C) X-rays from the accretion disk D) the sucking force from the black hole, which will cause his head to explode