5th Edition

ISBN: 8220103026918

Author: Walker

Publisher: PEARSON

Concept explainers

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.

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Textbook Question

Chapter 11, Problem 6PCE

BIO Predict/Calculate Force to Hold a Baseball A person holds a 1.42-N baseball in his hand, a distance of 34.0 cm from the elbow joint, as shown in Figure 11-40. The biceps attached at a distance of 2.75 cm from the elbow, exerts an upward force of 12.6 N on the forearm. Consider the forearm and hand to be a uniform rod with a mass of 1.20 kg. (a) Calculate the net torque acting on the forearm and hand. Use the elbow joint as the axis of rotation. (b) If the net torque obtained in part (a) is nonzero, in which direction will the forearm and hand rotate? (c) Would the torque exerted on the forearm by the biceps increase or decrease if the biceps were attached farther from the elbow joint?

Chapter 11, Problem 6PCE, BIO Predict/Calculate Force to Hold a Baseball A person holds a 1.42-N baseball in his hand, a

Figure 11-40 Problem 6 and 23

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Chapter 11, Problem 5PCE

Chapter 11, Problem 7PCE

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HER A man holds a 175-N ball in his hand, with the forearm horizontal (see the drawing). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 21.4 N and has a center of gravity as indicated. Upper am bone Flexor muscle cing fc Elbow joint 89) 00510 m r 0.0890 m 0.330 m- (a) Find the magnitude of M 1149 X N (b) Find the magnitude and direction of the force applied by the upper arm bone to the forearm at the elbow joint. magnitude direction downward Additional Materials Book ??TO MacBook Ait 7.

a)Calculate the bone shear force acting on the lumbar vertebra. Report the force in units of N b)Calculate the bone compressive force acting on the lumbar vertebra. c)Calculate the back extensor force (Fm) required to keep the trunk in the static position as shown. Report Fm, in units of N The weight of the trunk (Wtrunk) is 500 N, and it has a moment arm of 0.10 m. The weight of the arms (Warms) is 50 N, and it has a moment arm of 0.50 m. The horizontal force from the wall (Fwall-x) is 25 N, and it has a moment arm of 0.25 m. The vertical force from the wall (Fwall-y) is 50 N, and it has a moment arm of 0.75 m. The weight of the backpack (Wpack) is 25 N, and it has a moment arm of 0.15 m. The back extensor muscle has a moment arm of 0.05 m.

Chapter 11 Solutions

EBK PHYSICS

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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