Modified Mastering Physics with Pearson eText -- Access Card -- for Physics (18-Weeks)

5th Edition

ISBN: 9780136781356

Author: Walker, JAMES

Publisher: PEARSON

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Chapter 11, Problem 84GP

BIO Deltoid Muscle A crossing guard holds a STOP sign at arm’s length, as shown in Figure 11-63. Her arm is horizontal, and we assume that the deltoid muscle is the only muscle supporting her arm The weight of her upper arm is W_u = 18 N, the weight of her lower arm is W₁ = 11 N, the weight of her hand is W_h = 4.0 N, and the weight of the sign is W_s = 8.9 N. The location where each of these forces acts on the arm is indicated in the figure A force of magnitude f_d is exerted on the humerus by the deltoid, and the shoulder joint exerts a force on the humerus with horizontal and vertical components given by f_x and f_y respectively. (a) Is the magnitude of f_x greater than less than or equal to the magnitude off_x? Explain. Find (b) f_d, (c) f_x and (d) f_y (The weights in Figure 11-63 are drawn to scale; the unknown forces are to be determined. If a force is found to be negative, its direction is opposite to that shown )

Chapter 11, Problem 84GP, BIO Deltoid Muscle A crossing guard holds a STOP sign at arms length, as shown in Figure 11-63. Her

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Chapter 11, Problem 83GP

Chapter 11, Problem 85GP

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Chapter 11 Solutions

Modified Mastering Physics with Pearson eText -- Access Card -- for Physics (18-Weeks)

Ch. 11.1 - A bicycle wheel is mounted on an axle, as shown in...Ch. 11.2 - Consider two objects with the following...Ch. 11.3 - A Physics sign is supported symmetrically by two...Ch. 11.4 - A mobile made from three piggy banks (A, B, C) is...Ch. 11.5 - Prob. 5EYU Ch. 11.6 - Consider two objects with the following...Ch. 11.7 - Prob. 7EYU Ch. 11.8 - In system 1, a torque of 20 N m acts through an...Ch. 11.9 - The angular velocity of the spinning bicycle wheel...Ch. 11 - Two forces produce the same torque. Does it follow...

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