Solve the following problem:
Problem: You need to know the height of a room, but you have no tape measure. You fasten one end of a string to the ceiling of the room, and tie a small rock at the other end so it almost touches the floor. You start this simple pendulum swinging slightly, and measure its period, which is 3.29 seconds.
Part A- How tall is the room?
Show how you obtained the solution, so that I can better understand how to do it.