Basic Biomechanics
7th Edition
ISBN: 9780073522760
Author: Susan J Hall
Publisher: McGraw-Hill Education
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Chapter 14, Problem 8IP
A volleyball player’s 3.7-kg arm moves at an average angular velocity of 15 rad/s during execution of a spike. If the average moment of inertia of the extending arm is 0.45 kg m2, what is the average radius of gyration for the arm during the spike? (Answer: 0.35 m)
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2. a) Label the system provided below, including the reference frame, moment arms and vector forces
with the information provided.
Internal moment arm = 4cm +0.04m
External moment arm relative
to the segment weight = 25cm 0.25m
External moment arm relative
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Segment weight = 50 N
Load weight = 100 N
Lower leg segment angle relative
to horizontal plane = 45°
Quadriceps tendon angle = 45°
Axis of
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MF
SW
LW
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Chapter 14 Solutions
Basic Biomechanics
Ch. 14 - If you had to design a model of the human body...Ch. 14 - Construct a table displaying common units of...Ch. 14 - Skilled performance of a number of sport skills is...Ch. 14 - Prob. 5IPCh. 14 - How much angular impulse must be supplied by the...Ch. 14 - Given the following principal transverse axis...Ch. 14 - A volleyball players 3.7-kg arm moves at an...Ch. 14 - A 50-kg diver in a full layout position, with a...Ch. 14 - Prob. 10IPCh. 14 - The radius of gyration of the thigh with respect...
Ch. 14 - A 0.68-kg tennis ball is given an angular momentum...Ch. 14 - A 7.27-kg shot makes seven complete revolutions...Ch. 14 - Prob. 5APCh. 14 - The patellar tendon attaches to the tibia at a 20...Ch. 14 - A cavewoman swings a 0.75-m sling of negligible...Ch. 14 - A 7.27-kg hammer on a 1-m wire is released with a...Ch. 14 - Discuss the effect of banking a curve on a...
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- The following graph is simulated (but realistic) data from a VO₂max trial of a human athlete running (no gait changes). Estimate and label the following variables: VO2 (ml/kg/min) 1. VO₂max 2. Incremental cost of locomotion 3. Maximum aerobic speed 4. RMR + postural costs 70 60 50 40 30 20 10 0 2 3 4 5 6 7 8 9 10 11 12 13 MPHarrow_forwardThe graphs below show the force-versus-shortening-velocity and power-versus- shortening-velocity curves for four muscles in the human lower extremity. Note that these curves show this relationship only for shortening activations (positive shortening velocities), not lengthening activations. And, note that the values displayed on the axes of the graphs are absolute (not normalized) values of force, power, and velocity. These graphs apply to the next three questions. Force vs Shortening Velocity Power vs Shortening Velocity 1,500 400 1,200 300 2 900 200 600 100 300 0.0 0.5 1.0 1.5 2.0 0.0 0.5 1.0 1.5 2.0 Shortening Velocity (m/s) Shortening Velocity (m/s) muscle 1 muscle 3 muscle 2 muscle 4 Force (N) Power (W)arrow_forwardHow much force must be produced by the biceps brachii, attaching at 90? to the radius at 3 cm from the center of rotation at the elbow joint, to support a weight of 200 N held in the hand at a distance of 30 cm from the elbow joint? (Neglect the weight of the forearm and hand, and neglect any action of other muscles)arrow_forward
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