Page 1613 - College Physics For AP Courses
P. 1613
Answer Key 1601
19
(c)
21
(b)
23
(c)
25
(b)
27
(a)
29
(c)
31
(b)
33
(a)
35
(b)
37
(a)
39
(a)
41
(d)
43
(c). Because of conservation of momentum, the final velocity of the combined mass must be 4.286 m/s. The initial kinetic energy is . The final kinetic energy is , so the difference is
−161 J.
45
(a)
47
(d)
49
(c)
51
(b)
Chapter 9
Problems & Exercises
1
a)
b) It does not matter at what height you push. The torque depends on only the magnitude of the force applied and the perpendicular distance of the force's application from the hinges. (Children don't have a tougher time opening a door because they push lower than adults, they have a tougher time because they don't push far enough from the hinges.)
3
23.3 N
5
Given:
a) Since children are balancing:
So, solving for gives:
