(Solved): The circular disk of 100mm radius rotates about its z-axis at the constant speed p=20 rpm. The te ...

The circular disk of $100\mathrm{mm}$ radius rotates about its $z$-axis at the constant speed $p=20$ $\mathrm{rpm}$. The telescoping arm $OC$ rotates about the $Y$-axis at a constant rate $N=30\mathrm{rpm}$ and is currently shortening at a constant rate of $50\mathrm{mm}/\sec$. There is no rotation about the $X$ axis. Find the velocity and acceleration of the point $D$ on the disk.