Hi there!
We can begin by finding the acceleration of the block.
Use the kinematic equation:

The block starts from rest, so:

Now, we can do a summation of forces of the block using Newton's Second Law:

mb = mass of the block
T = tension of string
Solve for tension:

Now, we can do a summation of torques for the wheel:

Rewrite:

We solved that the linear acceleration is 1.5 m/s², so we can solve for the angular acceleration using the following:

Now, plug in the values into the equation:

Answer:
Which of the following was not a reaction to John Brown's execution because of his failed raid on Harper's Ferry ???????
Explanation:
The energy stored in a capacitor is given by

where C is the capacitance and V the voltage applied.
In our problem,

, while the energy is

. We can then solve the formula to find V:
David doesn't need to do anything at all. His explanation has already
been verified. He saw lights in the sky. He doesn't know what they are.
Therefore, by definition, they are UFOs ... Unidentified Flying Objects.
Period. End of discussion.
Huge numbers of unidentified things have been observed flying over
Roswell during the past many years. Also over Toronto, Toledo, Tulsa,
and Texarkana. In every single case, somebody didn't know what they
were. Isn't that a mysterious "coincidence" ? Oooweeooo ...
Well I'm not buying it. Put that together with all the blood moons lately, and
it becomes obvious that the end times are near. Somebody somewhere knows
more than they're letting on, and all of them are hiding the truth from us.