The clouds that orbit around the earth is called ___________________.
Fill in the blank(s) with the appropriate word(s).
Kordylewski clouds
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Mean Life: The mean life (time constant) of rubidium-86 is 26.8 d. What is its half-life?
Fill in the blank(s) with the appropriate word(s).
If the number of turns on the secondary coil of a transformer are less than those on the primary, the result is a
A) step-down transformer. B) step-up transformer. C) 120-V transformer. D) 220-V transformer. E) a dc transformer.
How does the energy of atoms in a hot object compare to the energy of atoms in a cold object?
A. Hot object atoms have more chemical and kinetic energy B. Hot object atoms have more chemical energy C. Hot object atoms have more potential and kinetic energy D. Hot object atoms have more potential energy E. Hot object atoms have more kinetic energy
Tripling the linear size of an object multiplies its area by
A) 3 and its volume by 9. B) 9 and its volume by 18. C) 9 and its volume by 27. D) 27 and its volume by 81. E) none of the above