A disk rotates at an angular acceleration of 20 rad/s 2 about its axis. The radius of the disk is 20cm. What is the centripetal acceleration at a point on the edge of the disk when its angular speed is 16 rad/s

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)