part a)
The angular velocity is the ratio between the tangential velocity and the radius of the orbit:

we already have the radius of the orbit, r=4.0 m, but we have to find the tangential velocity v.
We know that the perimeter of the orbit is

And that the Tornado takes t=2.0 s to make one revolution (so, it takes 2.0s to complete one perimeter), so the tangential velocity is

Therefore, the angular velocity is

part b) The time the plane takes to do one circle is

Similarly to what we have done before, the perimeter of the orbit is

And so the tangential velocity is

And the angular velocity of the plane is given by
