Answer:

Explanation:
information we have:
mass: 
lenght: 
frequency: 
time: 
and from the information we have we can calculate the angular velocity
. which is defined as


----------------------------
Now, to calculate the torque
We use the formula

where
is the moment of inertia and
is the angular acceleration
moment of inertia of a uniform rod about the end of it:

substituting known values:

for the torque we also need the acceleration
which is defined as:

susbtituting known values:

and finally we substitute
and
into the torque equation
: