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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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A metal  sphere is  insulated  electrically  and is given  a charge. If  25 electrons  are added to  the sphere in  giving a  charge, how  many  Coulombs  are added to  the sphere? 
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1)  _______  A) 
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- 4.0  ×  10 - 20  C 
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B)  - 25 C 
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- 4.0  ×  10 - 18  C 
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D)  - 40 C    2
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A small  piece of  aluminum  (atomic  number 13)  contains    (The atomic  number is  the number  of protons; it  determines  the  (positive)  electric  charge of the  nucleus and,  thus, the  number of  electrons in  a neutral  atom.) If the  piece of  aluminum  has a net  positive  charge of   what  fraction of  the electrons  that the  aluminum  had when it  was neutral  would have  had to be  lost? 
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2)  _______  A) 
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1.4  ×  10 - 21 
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B)   
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1.9  ×  10 - 20 
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D)      3
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Suppose a  van de  Graaff  generator  builds a  negative  static  charge, and  a grounded  conductor is  placed near  enough to it  so that a   of  negative  charge arcs  to the  conductor.  Calculate the  number of  electrons  that are  transferred. 
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3)  _______  A) 
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7.0 
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B)  1.12  × 1
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4.38  ×  10 13 
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D)  43.8    4
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An asteroid  of mass  58,000 kg  carrying a  negative  charge of   is   from  a second  asteroid of  mass    carrying a  negative  charge of    What is the  net force the  asteroids  exert upon  each other?  and   
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4)  _______  A) 
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0.0062 N 
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B)  510,000  N 
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0.000040 N 
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D)  570,000  N    5
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A proton is  located at x  =   1.0 nm,    and an  electron is  located at      Find the  attractive  Coulombic  force  between  them. (The  value of k is   
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5)  _______  A) 
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1.4  ×  10 - 11  N 
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B)  5.3  × 1
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5.3  ×  10 - 18  N 
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This document was uploaded on 04/16/2010.

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