Physics-
General
Easy

Question

Two wedges, each of mass m, are placed next to each other on a flat floor. A cube of mass M is balanced on the wedges as shown. Assume no friction between the cube and the wedges, but a coefficient of static friction mu less than 1 between the wedges and the floor. What is the largest M that can be balanced as shown without motion of the wedges?

  1. fraction numerator m over denominator square root of 2 end fraction    
  2. fraction numerator mu m over denominator square root of 2 end fraction    
  3. fraction numerator 2 mu m over denominator 1 minus mu end fraction    
  4. All M will balance    

The correct answer is: fraction numerator 2 mu m over denominator 1 minus mu end fraction

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