# A solid disk, spinning counter-clockwise, has a mass of 7 kg and a radius of 8 m. If a point on the edge of the disk is moving at 2 m/s in the direction perpendicular to the disk's radius, what is the disk's angular momentum and velocity?

Mar 5, 2017

$\omega = 0.25 r a {\mathrm{ds}}^{-} 1$

$p = 1.75 k g {m}^{2} {s}^{-} 1$

#### Explanation:

Angular velocity is given by

$\omega = \frac{v}{r} = \frac{2}{8} = 0.25$

and angular momentum is

$p = m \omega = 7 \times 0.25 = 1.75$