The phase angle of a series RL ac circuit with a 100-? resistor and a 20.0-mH inductor is 70.0°. What is the inductive reactance of this circuit?
A) 150 ? B) 175 ? C) 100 ? D) 275 ? E) 200 ?
D
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Which of the patterns shown below would appear on a screen when monochromatic light first passes through a narrow slit for which a = ? and then strikes the screen? Note that the darkest area in each illustration represents the brightest area on the screen
a.
b.
A successfully tested hypothesis may take on the status of a(n)
a. experimental result. b. theory. c. scientific law. d. concept. e. superior hypothesis.
The most accurate way of finding the distance to some very far away stars might be by observing
A. the rate of variation in their luminosity. B. their motion relative to nearby stars. C. their orbiting planets. D. the variation in their position in the night sky on successive nights.
What do we mean by hyperspace?
A) It is any space with more than three dimensions. B) It is another word for spacetime. C) It is a space through which it is possible to travel fast. D) It is a space with a hyperbolic geometry.