AP EAPCET 24-Aug-2021 Shift 1 Paper

Given that, mass of rod =m
Length of rod, L=21
Initial and final angular velocities are 0 and ω respectively,
Time taken =t
We know that, torque acting on body having moment of inertia (I) and angular acceleration (α) is
τ=lα
where, I=

1

12

ML2=

1

12

m(2)2
=

1

3

ml2
and α=

ωf−ωi

t

=ω−0t=

ω

t

Now, substituting the values, we get
τ=

1

3

ml2

ω

t