A system absorbs 80 J through heating while doing 100 J of external work. What is the change in the internal energy of the system?

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• The work done by the centripetal force F when a body completes one revolution around a circle of radius R is:

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  (B) 2RF
  (C) RF
  (D) zero

  ►Correct Option
  
  Correct Option is: D
  

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