HRW - PROBLEM SUPPLEMENT #1
        80.  The only force acting on a particle is conservative force F.
             If the particle is at point A, the potential energy of the 
             system associated with F and the particle is 40 J. If the 
             particle moves from point A to point B, the work done on the 
             particle by F is +25 J.  What is the potential energy of the 
             system with the particle at B?

        92.  A single conservative force F = (6.0x -12)i N, where x is in
             meters, acts on a particle moving along an x axis.  The 
             potential energy associated with this force is assigned a
             value of 27 J at x = 0.  (a) Write an expression for the
             potential energy U as a function of x.  (b) What is the 
             maximum positive potential energy?  (c) At what values of x 
             is the potential energy equal to zero?

        FISHBANE - CHAPTER 7
        63.  A 3.0 kg block is held against a spring with spring constant
             k = 25 N/cm, compressing the spring 3.0 cm from its relaxed
             position.  All of this takes place on a ramp inclined upward
             at a 20° angle.  When the block is released, the spring
             expands and pushes the block up the ramp.  The coefficient
             of kinetic friction between the block and the surface is 
             mu_k = 0.1.  (a) What is the work done on the block by the
             spring as it extends from its compressed position to its
             equilibrium position?  (b) by friction while the block moves
             3.0 cm as in part (a)?  (c) by gravity during the same
             motion?  (d) What is the speed of the block when the spring
             reaches its equilibrium position?  (e) If the block is not
             attached to the spring, how far up the incline will it slide
             before it comes to rest?  (f) Suppose that the block is
             attached to the spring so that the spring is extended when
             the block slides past the equilibrium point.  By how much
             will the spring be extended before the block comes to rest?

        SERWAY - CHAPTER 7

        59.  A 200-g block is pressed against a spring of force constant 
             1400 N/m until the block compresses the spring 10 cm.  The 
             spring rests at the bottom of a ramp inclined at 60 degrees 
             to the horizontal.  Determine how far up the incline the 
             block moves before momentarily coming to rest, (a) if there 
             is no friction between the block and the ramp and (b) if the 
             coefficient of kinetic friction is 0.4.

        SERWAY - CHAPTER 8

        56.  A 10-g mass is attached to the end of an unstressed, light, 
             vertical spring (k = 49 N/m) and then dropped.  Answer the 
             following questions by considering the potential energy due 
             to the spring plus the potential energy due to gravity, i.e. 
             measure distances from the equilibrium position of the spring 
             with no mass attached. (a)  What is the maximum speed of the 
             falling mass?  (b) How far does the mass drop before coming 
             to rest momentarily?  (c) Repeat (a) and (b), but answer the 
             questions by considering the potential energy of the spring 
             with the mass attached, i.e. measure distances from the
             equilibrium position of the spring with the mass attached.