CHAPTER 7
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4. -0.901 m/s (minus means recoil, opposite to package direction.)
7. 12.6 m/s
15. a) 2.0 N*s, b) 580 N.
19. a) 380 kg m/s, b) -380 kg m/s, c) +380 kg m/s, d) 510 N.
   (taking east as positive.)
22. 0.440 kg has v'=1.1 m/s, 0.220 kg has v'=4.4 m/s after collision.
65. a) -0.194 m/s (recoil), b) 875 N.

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31. sqrt(2) = 1.41
34. smaller piece, 4.5 kJ, larger piece, 3.0 kJ.
41. 6.7 m/s at 60 degrees from the direction the first eagle was flying.
46. 0.438 m to the right of the 1.00 kg mass.
70. 5.46 m.


CHAPTER 8
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4. -230 rad/s^2.
8. a) 1.88 m/s, b) 3.0 m/s^2 towards the center.
11. 36000 rpm.
19. a) -0.42 rad/s^2, b) 210 s.
25. cw torque = mgL2-mgL1 if L2>L1.
26. 310 N at ends, 2.0 kN at each point of the bolt.

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27. 1.81 kg*m^2.
37. 935 revs, 10.9 s.
45. 56 J.
55. 0.77 kg*m^2.
62. a) 0.48 rad/s,  b) 1.32 rad/s.


CHAPTER 9
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1. Fc=430 N, 112-degrees below +x-axis.
6. a) FA=1700 N down, FB=2300 N up.  b) FA=2050 N down, FB=2960 N up.
11. T1=3060 N, T2=2570 N (horizontal cord).
21. a) 425 N, b) FA_x=425 N, FA_y=328 N.
22. F_left=530 N, F_right=180 N.
32. a) FM=250. N, b) FJ=244 N.