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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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Three  objects are  moving  along a  straight line  as shown in  the figure.  Taking the  positive  direction to  be to the  right, what is  the total  momentum  of this  system?  
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1)  _______  A)  + 1 0 6  kg  m/ + 1 4 kg m/s 
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- 106 kg m/s  D) 
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0 kg m/s  E) 
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- 14 kg m/s    2) 
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Two  vehicles  approach a  right angle  intersection  and then  collide.  After the  collision,  they become  entangled. If  their mass  ratios were  1: 4 and  their  respective  speeds as  they  approached  were both  ,  find  the  magnitude  and direction  of the final  velocity of  the wreck. 
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2)  _______  A) 
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12.5 m/s at  79° 
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B)  15.7 m/s at  79° 
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16.3 m/s at  79° 
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D)  13.1 m/s at  79°    3
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A steel ball  is thrown in  the air with a  speed of   at an  angle of  70°  from the  horizontal. It  drops on  another steel  ball of  1.4  times its  mass resting  on a sandy  surface. If  the original  ball comes  to a rest after  the collision  and the  resting ball  bounces,  find the  horizontal  component  of its  velocity. 
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3)  _______  A) 
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1.7 m/s 
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B) 
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2.4 m/s 
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C) 
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0.72 m/s 
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D)  0. 8  
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A container  explodes and  breaks into  three  fragments  that fly off  120° apart  from each  other, with  mass ratios  1: 4: 2. If the  first piece  flies off with  a speed of    what is the  speed of the  other two  fragments?  (All  fragments  are in the  plane.) 
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4)  _______  A) 
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1.5 and  0.9 m/s 
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B)  1.0 and  3.0 m/s 
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0.9 and  3.0 m/s 
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D)  1.5 and  3.0 m/s    5
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A  480 kg  car moving  at  14.4 m/s  hits from  behind  another car  moving at   in  the same  direction. If  the second  car has a  mass of   and a  new speed of    what is the  velocity of  the first car  after the  collision? 
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5)  _______  A) 
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10.5 m/s 
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B) 
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This document was uploaded on 04/16/2010.

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