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Biology with MasteringBiology™ (8th Edition)

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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.  1) 
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An  alternating  current is  supplied to a  lightbulb,  which  strobes. A  motor  rotates a  white fan  (with one  blade  painted red)  at   in  the light  from the  strobing  bulb, and the  fan appears  to stand still.  At    the red blade  alternates  between two  positions  that are    apart. What  is the  angular  frequency of  the current?  (Be careful,  the light will  strobe  regardless of  the sign of  the current.) 
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1)  _______  A) 
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504  rad/s  π
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B)  1008 π   rad/s 
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252  rad/s  π
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D)  126 π   rad/s    2
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An  alternating  current is  supplied to  an electronic  component  with a rating  that it be  used only  for voltages  below    What is the  highest  that  can be  supplied to  this  component  while  staying  below the  voltage  limit? 
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2)  _______  A) 
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6 V 
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B) 
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12  V 
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C) 
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6  V 
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D)  14 4  
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At  3.68100017  kHz the  reactance in  a circuit of a    capacitor  and an  inductor are  equal in  magnitude.  What is the  value of the  inductor? 
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3)  _______  A) 
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0.000020 mH 
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B)  0.00002 0 H 
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0.00021 mH 
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D)  0.00021  μH    4
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What is the  resonance  frequency of  an   circuit  consisting of    capacitor  and a    inductor? 
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4)  _______  A) 
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2.0 kHz 
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B) 
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0.31 kHz 
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C) 
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3.2 kHz 
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D)  12  k  
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An LC  circuit has a  resonance  frequency of   If  the inductor  in the circuit  has a value  of    what is the  capacitance  of the  circuit? 
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