Question

Please help with this question

Answer 1

$T = 2\pi \sqrt{\dfrac{L}{32}}$

$\dfrac{T}{2\pi} = \sqrt{\dfrac{L}{32}}$

$L = \dfrac{32 T^2}{4\pi^2} = \dfrac{8T^2}{\pi^2}$

$L = \dfrac{32 (2.2)^2}{4(3.14)^2} =3.927 \textrm{ feet}$

Second choice: 4 feet