Chapter 8 Problems 1, 2, 3 = straightforward, intermediate, challenging = full solution available in Student Solutions Manual/Study Guide = coached solution with hints available at www.cp7e.com = biomedical application Section 8.1 Torque
about (a) an axis
Chapter 1
Introduction
Answers to Even Numbered Conceptual Questions
2. 4. Atomic clocks are based on the electromagnetic waves that atoms emit. Also, pulsars are highly regular astronomical clocks. (a) (b) (c) 6.
~ 0.5 lb 0.25 kg or ~10 -1 kg ~ 4 lb 2 kg
Chapter 2
Motion in One Dimension
Quick Quizzes
1. 2. (a) 200 yd (b) 0 (c) 0
(a) False. The car may be slowing down, so that the direction of its acceleration is opposite the direction of its velocity. (b) True. If the velocity is in the direction chosen
Chapter 3
Vectors and Two-Dimensional Motion
Quick Quizzes
1. (c). The largest possible magnitude of the resultant occurs when the two vectors are in the same direction. In this case, the magnitude of the resultant is the sum of the magnitudes of A and B
Chapter 5
Energy
Quick Quizzes
1. (c). The work done by the force is W = F ( x ) cos , where is the angle between the direction of the force and the direction of the displacement (positive x-direction). Thus, the work has its largest positive value in (c)
Chapter 4
The Laws of Motion
Quick Quizzes
1. (a) True. Motion requires no force. Newton's first law says an object in motion continues to move by itself in the absence of external forces. (b) False. It is possible for forces to act on an object with no r