Y
0.07m
0.07m
Ry
ax
W = mg
Rx
??
foot center of mass
X
In the middle of the swing phase of a gait cycle in brisk walking, a walker had the
horizontal acceleration $a_x = -1.9 \text{ m/s}^2$, the vertical acceleration $a_y = -10.8 \text{ m/s}^2$, the
moment of inertia of the foot about its center of mass is $I_{cm} = 0.0015 \text{ kg} \cdot \text{m}^2$ and the
angular acceleration of the foot is $\alpha_z = -57 \text{ rad/s}^2$. The mass of the foot is 2.0 kg
The moment from horizontal joint reaction force is ____ N\cdot m.
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