The figure above is an anatomical sketch of the leg and hip bones indicating the
ID: 2145438 • Letter: T
Question
The figure above is an anatomical sketch of the leg and hip bones indicating the forces acting on them. We is the weight of the body. The weight of the leg (WL) is 1/7 of W and it acts as shown in the figure.
A) Compute F1 in terms of W.
B) Compute the magnitude and direction of the reaction force R.
Explanation / Answer
Rx = Fcos(70 degree) = 1.57*cos(70 degree) W = 0.54 W
Ry = Fsin(70) + W - W/7 = W(1.57*sin(70 degree) + 1 - (1/7)) = 2.33 W
R = sqrt(2.33^2+0.54^2) W = 2.39 W
direction = 180+arctan(2.33/0.54) = 257 degrees counterclokwise