Question

3. (2 pts.) A soccer player who weighs 835 N jumps up in the air to perform a "bicycle kick” (see figure). If the moment of inertia of his whole-body relative to an axis through his center of mass is 7.2 kg.m2, what is his radius of gyration in this posture? Radius of Gyration:

Answer 1

weight = 835N

so, mass= 835/g =835/9.8=85.2 kg

and moment of inertia

I = mk

k is radius of gyration

so,

$k=\sqrt\frac{I}{m}$

so we calculate

k=0.29m