Question

A flywheel has an angular momentum of 40 kg m^2 s^-1. The radius of gyration of the flywheel is 0.65m and its rotating at 250 RPM. 

Whats the angular velocity in rad/s?

Whats its mass?

Answer 1

$$\omega=250\frac{2\pi}{60}=26.18\frac{rad}{s} \\m=\frac{L}{R_g^2\omega} \\m=\frac{40}{0.65^2(26.18)}=3.6\ kg$$