TABLE 7-1 Center of Mass of Parts of Typical Human Body, given as % (full height and mass = 100 units) Distance of Hinge Points from Floor (%) Hinge Points (•) (Joints) Center of Mass (x) (% Height Above Floor) Percent Mass 91.2% 81.2% Base of skull on spine elbow 62.2%* wrist 46.2%* Head Trunk and neck 93.5% 71.1% 71.7% 6.9% 46.1% 6.6% Shoulder joint Upper arms Lower arms 55.3% 4.2% 52.1% Hip joint Hands 43.1% 1.7% Upper legs (thighs) 42.5% 21.5% 28.5% Knee joint Lower legs 18.2% 9.6% 4.0% Ankle joint 1.8% 3.4% Feet Body см 3D 58.0% 100.0% * For arm hanging vertically.

TABLE 7-1 Center of Mass of Parts of Typical Human Body, given as % (full height and mass = 100 units) Distance of Hinge Points from Floor (%) Hinge Points (•) (Joints) Center of Mass (x) (% Height Above Floor) Percent Mass 91.2% 81.2% Base of skull on spine elbow 62.2%* wrist 46.2%* Head Trunk and neck 93.5% 71.1% 71.7% 6.9% 46.1% 6.6% Shoulder joint Upper arms Lower arms 55.3% 4.2% 52.1% Hip joint Hands 43.1% 1.7% Upper legs (thighs) 42.5% 21.5% 28.5% Knee joint Lower legs 18.2% 9.6% 4.0% Ankle joint 1.8% 3.4% Feet Body см 3D 58.0% 100.0% * For arm hanging vertically.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter14: Static Equilibrium, Elasticity, And Fracture

Section: Chapter Questions

Problem 12PQ

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Concept explainers

Spring Potential Energy

The potential energy is the energy possessed by a body by virtue of its position or the energy held by the object due to its position relative to other objects, its force like stresses, charge, and other factors affecting the particles of the body. The potential energy is the measure of the net work done by or on the body. The spring potential energy is the potential energy stored due to the deformation of an elastic spring and this elasticity is due to the stretched spring. The elasticity is the ability of a solid-state matter to come back to its equilibrium position or original position after any kind of external force is acted on it. It is also known as Elastic potential energy. The potential energy here is caused due to the displacement of the spring from its equilibrium position to another position and this potential energy is equal to the net work done due to the stretching of the spring. It also resembles the same mechanics of the oscillation of a simple pendulum, where due to the external force, the object moves from its equilibrium position to its maximum ends and the periodic motion continues till it comes back to the equilibrium position to rest. 

Question

(I) Assume that your proportions are the same as those in
Table 7–1, and calculate the mass of one of your legs.

TABLE 7-1 Center of Mass of Parts of Typical Human Body, given as %
(full height and mass = 100 units)
Distance of Hinge
Points from Floor (%)
Hinge Points (•)
(Joints)
Center of Mass (x)
(% Height Above Floor)
Percent
Mass
91.2%
81.2%
Base of skull on spine
elbow 62.2%*
wrist 46.2%*
Head
Trunk and neck
93.5%
71.1%
71.7%
6.9%
46.1%
6.6%
Shoulder joint
Upper arms
Lower arms
55.3%
4.2%
52.1%
Hip joint
Hands
43.1%
1.7%
Upper legs (thighs) 42.5%
21.5%
28.5%
Knee joint
Lower legs
18.2%
9.6%
4.0%
Ankle joint
1.8%
3.4%
Feet
Body см 3D
58.0%
100.0%
* For arm hanging vertically.

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