How do astronomers think Saturn generates its internal heat?
A) radioactive decay
B) internal friction due to its high rotation rate
C) chemical processes
D) by raining dense helium droplets from higher to lower altitudes, resembling the process of differentiation
E) nuclear fusion in the core
D
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Shell Radius: A hydrogen atom with a barely bound electron may have an average radius as large as a bacterium, which is a radius of 14 ?m. What is the nearest principal quantum number of the atom in this state? The radius for ground state hydrogen is 0.0529 nm.
A. 514 B. 51 C. 16 D. 264,650
A wire has a cross-sectional area of 0.10 mm2. If there are 4.0 × 1028 atoms per cubic meter in this wire, and if each atom contributes 2 free electrons, what is the drift velocity of the electrons when the current in the wire is 6.0 A?
(e = 1.60 × 10-19 C) A) 0.0047 m/s B) 0.0092 m/s C) 0.94 m/s D) 0.019 m/s
Why are clay surfaces good at promoting the formation of biological polymers?
A) they are the only types of material monomers will stick to B) they bring monomers close together, allowing them to react with each other C) they are very common on the Earth D) clays are made of biological polymers
Consider a large molecular cloud that will give birth to a cluster of stars. Which of the following would you expect to be true?
A) A few massive stars will form, live, and die before the majority of the star's clusters even complete their protostar stage. B) All the stars in the cluster will be of about the same mass. C) All the stars in the cluster will become main-sequence stars at about the same time. D) All the stars in the cluster will have approximately the same luminosity and surface temperature.