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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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A child does  350 J of  work while  pulling a box  from the  ground up to  his tree  house with a  rope. The  tree house is   above  the ground.  What is the  mass of the  box? 
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1)  _______  A) 
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3.9 kg 
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B) 
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4.3 kg 
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C) 
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3.2 kg  
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D)  2. 6  
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You carry a  7.0 kg bag of  groceries   above  the ground  at constant  velocity  across a   room.  How much  work do you  do on the  bag in the  process? 
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2)  _______  A) 
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158 J 
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B) 
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134 J 
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C) 
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0.0 J 
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D)  82  J  
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A crane lifts    steel beam  vertically  upward a  distance of   How  much work  does the  crane do on  the beam if  the beam  accelerates  upward at    Neglect  frictional  forces. 
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3)  _______  A) 
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5.8  ×  10 5  J 
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B)  3.4  × 1
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4.9  ×  10 5 J 
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D)  4.0  × 1   4
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A traveler  pulls on a  suitcase  strap at an  angle 36°  above the  horizontal. If   of  work are  done by the  strap while  moving the  suitcase a  horizontal  distance of   what  is the tension  in the strap? 
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4)  _______  A) 
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92 N 
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B) 
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85 N 
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C) 
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61 N 
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This document was uploaded on 04/16/2010.

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