Ch. 6 Homework, Phy 131, Fall 1997, Tulane

6.1   (a) 7200 J    (b) 7200/4 J    (c) 7200*4 J

6.4   (a) 320 J     (b) -196 J    (c) 124 J

6.5   (a) 9 J   (b) 12 J    (c) 4.6 m/s

6.8   (a) only gravity does work, 102 J  (b) 102 J
      (c) 5.8 m/s       (d) 6.6 m/s

6.16  3920 J

6.20  20.4 m

6.29  (a) 0.86 m   (b) It will oscillate back and forth in time.

6.42  (a) 78.4 w   (b) 235 J

6.45  (a) 1.4*10^9 w

6.48  (a) 6 w   (b) -49 w    (c)  24 w

6.60  (a) 1.8*10^7 J   (b) 1.4*10^10 J
      (c) -9.9*10^9 J  (d) 1.6*10^6 w

6.77  (a) mg(h-2R)
      (b) a = 2g (h-2R)/R
      (c) For the block not to leave the track, a (minimum) = g, i.e.
          h(minimum) = 2.5 R