A solid disk with a radius of 10 cm and a mass of 2 kg has an axial angular momentum of 4 kg m 2 / s.

A solid disk with a radius of 10 cm and a mass of 2 kg has an axial angular momentum of 4 kg m 2 / s. Find the linear velocity of the points at the edge of the disc.

For the linear speed of points, the formula is:
L = I * ω = m * R2 / 2 * V / R = m * R * V / 2

Let us express V:
V = 2 * L / (m * R)
Where
V is the linear velocity of the points;
L is the axial angular momentum;
m is the mass of a solid disk;
R is the radius of the disc.

V = 2 * 4 / (2 * 0.1) = 40 m / s.

Answer: V = 40 m / s.