As illustrated in Fig. 10.12, consider the person performing extension/flexion movements of the lower leg about the knee joint (point O) to investigate the forces and torques produced by muscles crossing the knee joint. The setup of the experiment is described in Example 10.3 above. The geometric parameters of the model under investigation, some of the forces acting on the lower leg and its free-body diagrams are shown in Figs. 10.13 and 10.14. For this system, the angular displacement, angular velocity, and angular accelera- tion of the lower leg were computed using data obtained during the experiment such that at an instant when 0 = 65°, 0 = 4.5 rad/s, and a = 180 rad/s?. Furthermore, for this sys- tem assume that a = 4.0 cm, b = 23 cm, B = 25°, and the net torque generated about the knee joint is Mo = 55 Nm. If the torque generated about the knee joint by the weight of the lower leg is Mo = 11.5 Nm, determine: (a) The mass moment of inertia of the lower leg about the knee joint (b) The weight of the lower leg (c) The tension in the patellar tendon (d) The reaction force at the knee joint
As illustrated in Fig. 10.12, consider the person performing extension/flexion movements of the lower leg about the knee joint (point O) to investigate the forces and torques produced by muscles crossing the knee joint. The setup of the experiment is described in Example 10.3 above. The geometric parameters of the model under investigation, some of the forces acting on the lower leg and its free-body diagrams are shown in Figs. 10.13 and 10.14. For this system, the angular displacement, angular velocity, and angular accelera- tion of the lower leg were computed using data obtained during the experiment such that at an instant when 0 = 65°, 0 = 4.5 rad/s, and a = 180 rad/s?. Furthermore, for this sys- tem assume that a = 4.0 cm, b = 23 cm, B = 25°, and the net torque generated about the knee joint is Mo = 55 Nm. If the torque generated about the knee joint by the weight of the lower leg is Mo = 11.5 Nm, determine: (a) The mass moment of inertia of the lower leg about the knee joint (b) The weight of the lower leg (c) The tension in the patellar tendon (d) The reaction force at the knee joint
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter3: Transient Heat Conduction
Section: Chapter Questions
Problem 3.41P
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As illustrated in Fig. 10.12, consider the person performing extension/flexion movements of the lower leg
about the knee joint (point O) to investigate the forces and torques produced by muscles crossing the knee joint. The setup of the experiment is described in Example 10.3 above.
The geometric parameters of the model under investigation,
some of the forces acting on the lower leg and its free-body
diagrams are shown in Figs. 10.13 and 10.14. For this system, the
angular displacement, angular velocity, and angular accelera-
tion of the lower leg were computed using data obtained
during the experiment such that at an instant when 0 = 65°,
0 = 4.5 rad/s, and a = 180 rad/s?. Furthermore, for this sys-
tem assume that a = 4.0 cm, b = 23 cm, B = 25°, and the net
torque generated about the knee joint is Mo = 55 Nm. If the
torque generated about the knee joint by the weight of the lower
leg is Mo = 11.5 Nm, determine:
(a) The mass moment of inertia of the lower leg about the knee
joint
(b) The weight of the lower leg
(c) The tension in the patellar tendon
(d) The reaction force at the knee joint
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Fig. 10.12 Knee extension
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