Appendix H: Answers to Problems in Part II

Answers to Problems in Part II

CHAPTER 10

1. 1. 111.25 N

   2. 73 kg

   3. 27.94 cm

   4. 6.1 m/s

   5. 2.84 liters

2. 1. 50 cm

   2. 22.4 cm

   3. 54 cm

   4. 71.7 cm

3. 1. x = 40.78 m/s; y = 19.02 m/s

   2. x = −60.1 N; y = 60.1 N

   3. x = 75.85 kg; y = −90.39 kg

   4. x = −21.65 m/s²; y = −12.5 m/s²

4. s = 28 m; d = 12 m

5. x = 627.8 N; y = 168.2 N

6. V = 28.65 m/s; v = 93.98 ft/s;

   θ = 29.25 degrees or .51 radians

7. Horizontal (x) = 103.4 N;

   vertical (y) = 37.6 N

8. 1. 1992 m at 106°

   2. Rectangular = −535 m, 1919 m

      Polar = 1992 m, −74 degrees or 106 degrees from start

9. x = 112.5 lb; y = 51 lb; R = 123.5 lb;

   θ = 24°

10. 1. x (stabilizing) < 834.5 N;

       y (rotary) < 337 N

    2. 1359 N; θ = 20 degrees

CHAPTER 11

1. 1,500 m = 12.19 m/s

   5,000 m = 11.27 m/s

   10,000 m = 11.09 m/s

2. t = 0.177 sec

3. t = 3.9 sec Θp; total = 7.8 s

   y = 38.2 m/s

4. t = 3.46 sec; s = 58.7 m

   t = 2.4 sec; s = 49.88 m

5. Start of force: ω = 1,089.7 deg/sec (19 rad/sec)

   Contact: ω = 1,153.8 deg/sec (20 rad/sec)

   v = 7 m/s

CHAPTER 13

1. x (stabilizing) = 77.6 N; y (rotary) = 289.8 N

2. E = 6.7 N

3. EA = 1.6 m; RA = 0.4 m

4. EA = 1.6 m; RA = 0.4 m

5. E = 287.5 N

6. 3 cm: T = 16.5 Nm

   15 cm: T = 82.4 Nm