8. If you stand on one foot while holding your other leg up behind you, your muscles apply a force to hold your leg in this raised position. The leg pivots at the knee joint, and the force that holds the leg up is provided by a tendon attached to the lower leg as shown in the Figure. Assume that the lower leg and the foot have a combined mass of 4.0 kg, and that their combined center of gravity is at the center of the lower leg. a. How much force must the tendon exert to keep the leg in this position? b. As you hold your leg in this position, the upper leg exerts a force on the lower leg at the knee joint. What are the magnitude and direction of this force?

8. If you stand on one foot while holding your other leg up behind you, your muscles apply a force to hold your leg in this raised position. The leg pivots at the knee joint, and the force that holds the leg up is provided by a tendon attached to the lower leg as shown in the Figure. Assume that the lower leg and the foot have a combined mass of 4.0 kg, and that their combined center of gravity is at the center of the lower leg. a. How much force must the tendon exert to keep the leg in this position? b. As you hold your leg in this position, the upper leg exerts a force on the lower leg at the knee joint. What are the magnitude and direction of this force?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Axial Load

When a bar of the uniform cross-section is acted by a load, such that the load acts along the longitudinal axis of the bar, such kinds of loadings are known as axial loadings. In general terms, a load is an external force acting on a component. An axial load acts perpendicular to the geometric cross-section of the component. Based on the direction of the application of the load, an axial load can be tensile or compressive. The analysis of bodies under the action of axial loads is generally studied under the branch of mechanics, known as statics.

Question

8. If you stand on one foot while holding your other leg up behind you, your muscles apply a force to hold
your leg in this raised position. The leg pivots at the knee joint, and the force that holds the leg up is
provided by a tendon attached to the lower leg as shown in the Figure. Assume that the lower leg and the
foot have a combined mass of 4.0 kg, and that their combined center of gravity is at the center of the lower
leg.
a. How much force must the tendon exert to keep the leg in this position?
b. As
hold
your leg in this position, the upper leg exerts a force on the lower leg at the knee joint.
you
What are the magnitude and direction of this force?
The tendon provides
the torque to raise
the lower leg.
5.0 cm-
50 cm

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