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Klausef Physics

By: a guest on Oct 19th, 2011  |  syntax: None  |  size: 0.86 KB  |  views: 618  |  expires: Never
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  1. In 1990 Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth.
  2. (a) How much work was done on the object by Arfeuille in this lift, assuming the object was lifted at constant velocity?
  3.  
  4. F=m*a
  5. W=F*d
  6.  
  7. Force is constant in this case since the object isn't being affected by anything but his teeth and gravity.
  8.  
  9. F=281.5*9.8=2758.7N
  10. W=F*.171=471.74J
  11.  
  12. This is the correct answer
  13.  
  14. (b) What total force was exerted on Arfeuille's teeth during the lift?
  15.  
  16. ??? It asks for the answer in kiloNewtons. My initial impression was to take the function for Force (in this case it's just the const 2758.7) and to integrate it for the distance .171 meters.
  17.  
  18. integrate 2758.7 with respect to x from 0 to .171 = 2758.7x evaluated from 0 to .171
  19.  
  20. 2758.7*0.171-0=471.74N = 4.72kN
  21.  
  22. This assumes he moves it at 1 meter per second.
  23.  
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