15. Rotational Equilibrium

A 70 kg, 1.90 m man doing push-ups holds himself in place making 20° with the floor. His feet and arms are, respectively, 1.15 m below and 0.4 m above his center of mass. You may model him as a thin, long board, and assume his arms and feet are perpendicular to the floor. How much force does the floor apply to each of his hands? Assume g=10 m/s².

In the context of vehicle dynamics, what is the point where the mass of the vehicle is considered to be concentrated and balanced?

In the Earth-Moon system, where is the center of mass ($\mathrm{barycenter}$) located relative to the two bodies?

The center of mass of two objects orbiting each other is always which of the following?