What are some of the things that make Earth unique among the terrestrial planets?
What will be an ideal response?
It is the only planet with an oxygen-rich atmosphere and an ozone layer. It is the only planet which has conditions that allow surface water to be stable as a liquid. It is the only planet which has a surface that has been significantly altered by plate tectonics. Earth's climate has been stable over much of its history. Earth has a very large moon relative to its size. Finally, Earth is the only planet we know of that harbors life.
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Calculate the number of atoms per unit volume in BCC solid sodium (Na) assuming that the lattice parameter for sodium is 0.428 nm.
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How does the resistance of a thick piece of copper wire compare to the resistance of a thin piece of copper wire?
A. The resistance of the thin piece is greater than that of the thick piece. B. The resistance of the thick piece is greater than that of the thin piece. C. Both the wire and narrow piece of copper provide the same resistance.
The open clusters were a population of relatively young stars, so where would you expect to see them from?
A.) In the halo with globular clusters. B.) In the disk. C.) In the bulge. D.) Only around the Sun. E.) Behind us.
A construction worker pushes a wheelbarrow 5.0 m with a horizontal force of 50.0 N. How much work is done by the worker on the wheelbarrow?
a. 10 J b. 1250 J c. 250 J d. 55 J