Chapter 8

Homework Answers

 

Multiple Choice Answers

2. a
3. d
4. c
11. c
14. d
19. d
23. c

Problem Answers

12. 3m
16. (a) 30°
(b) (π/6)rad
(c) 4.189 rad
(d) 58.6 m
18. 23 cm
23. 16 rad/s
24. 34 rad/s
25. 31400 rad/s
32.(a) Zero
(b) 80 s
(c) 320 rad/s
40. 20 rad/s
45.

If n is odd the gear goes in same sense and first gear.
47. 1.4 m
49. 0.75 m/s up
51. 2.3 m
58. 15 rad/s, 0.43 s
59. (a) 12.5 rad/s
(b) 62.8 rad
(c) 5.03 s
(d)
62. 5.2 m/s
70. elbow 5.8 Nm
shoulder 11 Nm
75. (a)
(b) 40 N
(c) 80 N
84. 3.0 kg, 1.8 kg
88.
96. At the contact point
105. 5970 N at 5.74°
108. (a) The force acts on the c.g.
(b)
(c)
(d)Weight and rope 2
(e)
116. 480 N up and 420 N up
120. (a)
(b) 100 N
(c) yes
130.
138.
149. 493 J
157.
158. 71%
162.
167. 3300 rad/s