Physics-
General
Easy

Question

If you want to pile up sand onto a circular area of radius R. The greatest height of the sand pile that can be erected without spilling the sand onto the surrounding area, if  is the coefficient of friction between sand particle is

  1. R    
  2.  mu squared straight R  
  3. mu R    
  4. straight R over mu    

The correct answers are: mu squared straight R, mu R

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