Consider an athlete wearing a weight boot, and from a sitting position, doing lower leg flexion/extension exercises to strengthen quadriceps muscles. The weight of the athlete's lower leg is W1 = 50 N and the weight of the boot is W2 = 100 N. As measured from the knee joint at point O, the center of gravity (point A) of the lower leg is located at a distance a = 20 cm and the center of gravity (point B) of the weight boot is located at a distance b = 50 cm. Determine the net moment generated about the knee joint when the lower leg is extended horizontally (position 1), and when the lower leg makes an angle of 25 deg (position 2), 55 deg (position 3), and 90 deg (position 4) with the horizontal.
Consider an athlete wearing a weight boot, and from a sitting position, doing lower leg flexion/extension exercises to strengthen quadriceps muscles. The weight of the athlete's lower leg is W1 = 50 N and the weight of the boot is W2 = 100 N. As measured from the knee joint at point O, the center of gravity (point A) of the lower leg is located at a distance a = 20 cm and the center of gravity (point B) of the weight boot is located at a distance b = 50 cm. Determine the net moment generated about the knee joint when the lower leg is extended horizontally (position 1), and when the lower leg makes an angle of 25 deg (position 2), 55 deg (position 3), and 90 deg (position 4) with the horizontal.
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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Transcribed Image Text:Consider an athlete wearing a weight boot, and from a sitting position, doing lower leg flexion/extension exercises to
strengthen quadriceps muscles. The weight of the athlete's lower leg is W1 = 50 N and the weight of the boot is W2 =
100 N. As measured from the knee joint at point O, the center of gravity (point A) of the lower leg is located at a
distance a = 20 cm and the center of gravity (point B) of the weight boot is located at a distance b = 50 cm. Determine
the net moment generated about the knee joint when the lower leg is extended horizontally (position 1), and when the
lower leg makes an angle of 25 deg (position 2), 55 deg (position 3), and 90 deg (position 4) with the horizontal.
b
(a)
(b)
a
1
A
1
WT
B
W.
3
4
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