Question

A disc rotates about its axis with a constant angular acceleration of 4 rad/s². Find the radial and tangential accelerations of a particle at a distance of 1 cm from the axis at the end of the first second after the disc starts rotating.

Answer 1

t = 1 sec, r = 1 cm = 0.01 m
 = 4 rd/s²
Therefore  ω= αt = 4 rad/s
Therefore radial acceleration,
A_n =ω²r = 0.16 m/s² = 16 cm/s²