Basic Biomechanics
7th Edition
ISBN: 9780073522760
Author: Susan J Hall
Publisher: McGraw-Hill Education
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Chapter 14, Problem 7IP
Given the following principal transverse axis moments of inertia and angular velocities, calculate the angular momentum of each of the following gymnasts. What body configurations do these moments of inertia represent?
| lcg(kg · m2) | (rad/s) | |
| A | 3.5 | 20.00 |
| B | 7.0 | 10.00 |
| C | 15.0 | 4.67 |
(Answers: A = 70 kg m2/s; B = 70 kg m2/s; C = 70 kg m2/s)
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These figures show that:
S
Vor (1-min¹)
30
A
2.5
20
1.5
1.0
0.5
(50)
10
Concentric
Eccentric
Exercise rate
(100)
20
(150)
Integrated EMG (counts min)
B
600
400
200
(50)
30
10
Mean torque on pedals (Nm)
(100)
Concentric
20
Exercise rate
(200)
(150)
Eccentric
30
O concentric contractions require more oxygen and more EMG than eccentric contractions
O concentric contractions are easier to perform than eccentric contractions
O eccentric contractions place a greater demand on the cardiovascular and nervous systems compared to
concentric contractions
O eccentric contractions use less oxygen but more EMG than concentric contractions
Based on the acceleration in the above ball rolling down an inclined plane (with vo = 0 meters per second), how far would it have traveled along the inclined plane in the first six seconds of rolling?
9 meters
16 meters
25 meters
36 meters
49 meters
The “mean-speed theorem” for calculating average velocity under constant acceleration, developed by Thomas Bradwardine and the Mertonian Calculators at Oxford University, is expressed algebraically as:
density = weight/volume
(m1)(v1) = (m2)(v2)
C. (vm) = 1/2 (v0 + vf)
s = (v0)(t) + 1/2 (a)(t2)
velocity = distance/time
Chapter 14 Solutions
Basic Biomechanics
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