quiz7 - QUIZ 7: POTENTIAL ENERGY & CONSERVATION OF ENERGY...

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Name___________________________________   MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.  1) 
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An object  of mass  is held at  a vertical  height  from  ground  level. It is  then  released  and falls  under the  influence  of gravity.  Which of  the  following  statement s is true in  this  situation?  ( Neglect  air  resistanc e.
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1)  ______ _  A T h e   k i n e t i c   e n e rg of  th ob je ct  is  de cr ea si ng T h e   t o t al  energy  of the  object  is  increasi ng. 
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The total energy of  the object is decreasing.  D) 
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The potential  energy of the object is increasing.  E) 
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The potential  energy of the object is decreasing and the kinetic energy is increasing.  F) 
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The potential  energy of the object is increasing and the kinetic energy is decreasing.  G) 
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The potential  energy of the object is not changing and the kinetic energy is increasing.    2) 
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An object  of mass 4  kg is  thrown  vertically  upwards  from  ground  level with  an initial  speed of  20 m/s.  Ignore  friction  and  use  =  10 m/ . What is  the kinetic  energy of  the object  as it  reaches  its  maximum  height? 
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2)  ______ _  A
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200 J 
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B)  800 J 
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400 J 
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D)  80 J 
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- 200 J 
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F)  - 800 J 
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- 80 J 
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H)  - 400 J 
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0 N 
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K)  None  of the other  hoices is correct.    3
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A 20 - kg  object is  resting at  the top of  a table 1.6  m above  ground  level. The  object is  then  picked up  and  moved to  a height  of 8.7 m  above  ground  level.  What is  the  change in  the  gravitatio nal  potential  energy of  this  object?  Use  g   = 10 m/
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3)  ______ _  A
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This note was uploaded on 04/30/2008 for the course PHYS 1111 taught by Professor Plascak during the Spring '08 term at UGA.

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quiz7 - QUIZ 7: POTENTIAL ENERGY & CONSERVATION OF ENERGY...

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