The power factor of an RL circuit with a 100-? resistor and a certain inductor is 0.60. What is the impedance of the circuit?
A) 170 ?
B) 85 ?
C) 340 ?
D) 100 ?
E) 60 ?
A
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Which of the following correctly arranges the layers of Earth’s atmosphere from closest to the surface to closest to space?
a. troposphere, stratosphere, exosphere, thermosphere b. stratosphere, exosphere, thermosphere, troposphere c. troposphere, stratosphere, thermosphere, exosphere d. thermosphere, troposphere, stratosphere, exosphere
Sort the following hypothetical discoveries into the appropriate bins as follows:
Consistent with theory: The statement describes a discovery that we could reasonably expect to find if the nebular theory is correct.
Not consistent with theory: The statement describes a discovery that would force us to modify or discard the nebular theory.
Which of the following is NOT a property of elliptical galaxies?
A. They have little dust or cold gas. B. They have prominent spiral arms. C. They contain mostly old (Pop II) stars. D. Stars are distributed smoothly throughout their volume.
When atoms unite by transferring electrons, they should form
a. a polar molecule. b. a covalent compound. c. an ionic compound. d. an organic compound.