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Biology with MasteringBiologyâ„¢ (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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The  components  of vectors    and   are  given as  follows:    =    - 9.2   =    - 4.5   =    - 6.1   =   + 4.3 The angle  (less than  180 degrees)  between  vectors    and  , in  degrees, is  closest to: 
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1)  _______  A) 
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170 
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B) 
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84 
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C) 
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10 
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D) 
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103 
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E)  7 7  
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The  magnitude  of   is  5.5.  Vector    lies in the  second  quadrant and  forms an  angle of    with the y - axis. The  components,   and  are closest  to: 
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2)  _______  A)    =   + 3 .1,    = - 4. 6      =   - 3.1,     =   + 4.6 
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  =   + 4.6,     =   - 3.1  D) 
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  =   - 4.6,     =   + 3.1  E) 
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  =   - 4.6,     =   - 3.1    3) 
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A hiker  walks  les to the  east in    then turns  around and  walks   to  the west in    What was  her average  velocity  during the  trip? 
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3)  _______  A) 
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1.3 mph 
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B) 
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0.92 mph 
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C) 
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3.9 mph 
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D)  1. 2  
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Vector    has length  4  units and  directed to  the north.  Vector    has length   and  is directed to  the south.  Calculate the  magnitude  and direction  of   
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4)  _______  A) 
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13 units, south 
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B)  13 units, north 
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5 units, south 
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D)  5 units,  north    5
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