BASIC BIOMECHANICS
8th Edition
ISBN: 9781259913877
Author: Hall
Publisher: RENT MCG
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Chapter 15, Problem 6AP
A 670-N swimmer oriented horizontally in freshwater has a body volume of 0.07 m3 and a center of volume located 3 cm
superior to the center of gravity.
a. How much torque does the swimmer’s weight generate?
b. How much torque does the buoyant force acting on the swimmer generate?
c. What can the swimmer do to counteract the torque and maintain a horizontal position?
(Answer: 0; 20.6 N-m)
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Students have asked these similar questions
The “mean-speed theorem” for finding average velocity under constant acceleration, proposed by the Oxford Calculators, and demonstrated geometrically by Nicole Oresme, is expressed algebraically as:
density = weight/volume
(m1)(v1) = (m2)(v2)
(vm) = 1/2 (v0 + vf)
s = (v0)(t) + 1/2 (a)(t2)
velocity = distance/time
Solve using Instantaneous Center of Zero Velocity
A scientist was investigating if differences in the frictional work performed on a model car can change
depending on its mass (in grams) and whether the car moves up or down an inclined plane. They decided to
measure the amount of frictional force experienced by the model car and the distance it traveled in meters.
The scientists were able to evaluate the frictional work using the following data.
Mass (g)
Distance (m) Force
Work Done by Friction (J)
car going up the incline
100
39
0.063
2.457
car going down the incline 70
39
0.2309 ?
It is known that the relationship between force and distance determines the work done by friction (W+).
W₁ = fd
Wf work done by friction
f = force
d = distance
Question:
How much work done by friction was exerted on the car as it moved down the inclined plane?
You may use a calculator.
1
2.457
9.005
11.46
16.16
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Chapter 15 Solutions
BASIC BIOMECHANICS
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Ch. 15 - A cyclist riding against a 12-km/hr headwind has a...Ch. 15 - A swimmer crossing a river proceeds at an absolute...Ch. 15 - Prob. 3APCh. 15 - A scuba diver carries camera equipment in a...Ch. 15 - A 50-kg person with a body volume of 0.055 m3...Ch. 15 - A 670-N swimmer oriented horizontally in...Ch. 15 - Based on your knowledge of the action of fluid...Ch. 15 - Explain the aerodynamic benefits of drafting on a...Ch. 15 - Prob. 9APCh. 15 - Explain why a curveball curves. Include a...
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