Posted by **Coreen** on Sunday, April 1, 2007 at 8:32am.

A spiral staircase winds up to the top of a tower in an old castle. To measure the height of the tower, a rope is attached to the top of the tower and hung down the center of the staircase. However, nothing is available with which to measure the length of the rope. Therefore, at the bottom of the rope a small object is attached so as to form a simple pendulum that just clears the floor. The period of the pendulum is measured to be 9.5s. What is the height of the tower?

You have an equation for the period of a pendulum

Period= 2PI sqrt (Length/g)

solve for length. Iwill be happy to critique your work.

- physics -
**richard**, Tuesday, November 18, 2008 at 12:23am
12.04 m

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