HRW PROBLEM SUPPLEMENT #1 - CHAPTER 6
        49. A small coin is placed on a flat, horizontal turntable.  The
            turntable is observed to make three revolutions in 3.14 s.
            (a) What is the speed of the coin when it rides without
            slipping at a distance of 5.0 cm from the center of the
            turntable?  (b) What is the acceleration (magnitude and
            direction) of the coin?  (c) What are the magnitude and
            direction of the frictional force acting on the coin if the
            coin has a mass of 2.0 g? (d) What is the coefficient of
            static friction between the coin and the turntable if the
            coin is observed to slide off the turntable when it is more
            than 10 cm from the center of the turntable?

        51. Imagine the standard kilogram is located on Earth's
            equator, where it moves in a circle of radius 6.4 X 10^6 m
            (Earth's radius) at a constant speed of 465 m/s due to 
            Earth's rotation.  (a) What is the magnitude of the 
            centripetal force on the standard kilogram during the 
            rotation?  Imagine that the standard kilogram hangs from 
            a spring balance at that location and assume that it would
            weigh exactly 9.80 N if Earth did not rotate.  (b) What is
            the reading on the spring balance; that is, what is the
            magnitude of the force on the spring balance from the 
            standard kilogram.

        57. A car is rounding a flat curve of radius R = 220 m at the
            curve's maximum design speed v = 94.0 km/hr.  What is the
            magnitude of the net force on the seat cushion from a 
            passenger with mass m = 85.0 kg?

        61. A 26 kg child on a steadily rotating Ferris wheel moves at
            a constant speed of 5.5 m/s around a vertical circular path
            of radius 12 m.  What are the magnitude and direction of the
            force of the seat on the child (a) at the highest point of
            the path and (b) at the lowest point of the path?

        70. A banked circular highway curve is designed for traffic
            moving at 60 km/h.  The radius of the curve is 200 m.
            Traffic is moving along the highway at 40 km/h on a rainy
            day.  What is the minimum coefficient of friction between
            tires and road that will allow cars to take the turn
            without sliding off the road?

        SERWAY - CHAPTER 5
        46. A ball is suspended from the ceiling of a moving car
            by a string 25 cm in length.  An observer in the car
            notes that the ball deflects 6 cm from the vertical
            toward the rear of the car.  What is the acceleration
            of the car?

        FISHBANE - CHAPTER 5
        28. A crate of mass 250 kg is loaded on the back of a truck.
            The coefficient of static friction between the crate and
            the truck bed is mu_s.  The truck decelerates such that
            it comes to a stop from a speed of 60 mi/hr in a distance
            of 140 m.  How large must mu_s be so that the crate does
            not slide forward on the the truck bed?

        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.  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?
            If the horizontal force is applied to the lower block
            instead, what is the maximum force that will give rise to
            the same motion?

        PROBLEM A1
         1. Consider again the "Tarzan question" from CH 5 (#23).
            (a) Show that 760 N is correct for the tension in the 
            vine when Tarzan steps off the cliff.  (b) When Tarzan
            has swung to an angle of 11 degrees, his speed will be
            4.62 m/s.  At this instant, what is Tarzan's radial
            acceleration?  What is the tension in the vine?  What
            is Tarzan's tangential acceleration?