**(a)**

The period of a simple pendulum is .

Where

:period in seconds.

: length in feet.

Find length as a function of the period .

Squaring on both sides.

Length as a function of the period is .

**(b)**

Find length of a pendulum whose period is seconds.

Substitute in .

Length of a pendulum whose period is seconds is feet.

**(a) **Length as a function of the period is .

**(b) **Length of a pendulum whose period is seconds is feet.

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