A disc rotates about its axis with a constant angular acceleration of `4rad/s^2`. Find the radia and tangential acceleration 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

A, B, C, D

Explanation

`t=1sec, r=1cm=0.01m`
1alpha=4rad/s^2`
there `omega=alphast=4rad/s`
threfore radial acceleration
`a_n=omega^2r=(4)^2xx0.01`
`=0.16m/s^2=16m/s^2`
Therefore tangential acceleration
`a_T=alphar=0.04m/s^2`
`=4cm/s^2`