PROBLEMS TO BE WRITTEN UP AND TURNED IN AT RECITATION

     This problem is due at your first recitation meeting after Thur 9/30.
     It should be written on a single sheet of paper (front and back), or
     if multiple sheets are used, staple them together.  For full credit, 
     the work must be neat, with clearly labeled free-body diagrams.  The 
     labels must be in BOTH words and symbols.  For each part, you must 
     BRIEFLY explain your strategy in words, as well as neatly showing 
     your physics equations and math, with proper units. (10 points total)
     
     FISHBANE - CHAPTER 5
     32. A block of mass 1.2 kg rests on top of another block of
         mass 1.8 kg, which rests on a frictionless surface.  The
         coefficient of static friction between the blocks is
         mu_s = 0.3.  (a) What is the maximum horizontal force that 
         can be applied to the upper block so that the blocks 
         accelerate together, without the upper block sliding on the 
         lower one?  (b) If the horizontal force is applied to the 
         lower block instead, what is the maximum force that will 
         give rise to the same motion?