T = _________N R = _________N ? = _________ When a person stands on tiptoe (a st
ID: 2240747 • Letter: T
Question
T = _________NR = _________N
? = _________ When a person stands on tiptoe (a strenuous position), the position of the foot is as shown in figure (a). The total gravitational force on the body, vector F g, is supported by the force narrowbold exerted by the floor on the toes of one foot. A mechanical model of the situation is shown in figure (b), where vector T is the force exerted by the Achilles tendon on the foot and vector R is the force exerted by the tibia on the foot. Find the values of T, R, and ? when Fg = n = 700 N. (Do not assume that vector R is parallel to vector T .)
Explanation / Answer
Rsin15=Tsin(theta);
Rcos15=Tcos(theta)+n;
Rcos15*18=Tcos(theta)*25;
on solving all of the above we get
R=2588.19;
T=1920.606;
theta=20.41
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