Methane should be rapidly destroyed in Titan's atmosphere, yet it is still present in appreciable amounts. How can this be?
A) on the surface of Titan live cows that are constantly producing methane gas
B) larger hydrocarbons like ethane and propane are being broken down by ultraviolet light into methane
C) methane may be continually evaporating from the surface and the interior
D) comet impacts are constantly supplying the atmosphere with fresh methane
C
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Mean Life: The mean life (time constant) of radon-222 is 5.526 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?
A. 9.82 × 107 B. 7.67 × 107 C. 8.34 × 108 D. 7.29 × 108 E. 8.56 × 108
Angular Momentum: A 24.5-kg child is standing on the outer edge of a horizontal merry-go-round that has a moment of inertia of 989 kg ? m2 about a vertical axis through its center and a radius of 2.40 m. The entire system (including the child) is initially rotating at 0.180 rev/s. Find the angular velocity if the child moves to a new position 1.10 m from the center of the merry-go-round.
Fill in the blank(s) with the appropriate word(s).
What types of potential energy are included in the work energy equation?
A. All forms of potential energy B. Elastic potential energy only C. Gravitational and elastic potential energy only D. Gravitational potential energy only
Pluto's density is most similar to
A) the terrestrial planets. B) the jovian planets. C) moons of the jovian planets. D) Mercury, but nor Venus, Earth, or Mars. E) Saturn, but not Jupiter, Uranus, or Neptune.