The equation for the time of one swing of a pendulum is given by T = 2 pi Squareroot L/32 where T is the time in seconds, pi almostequalto 3.14, & L is the length in feet. What is the length of the pendulum if it makes one (1) swing in 4 seconds, according to the formula? Solution T=2*pi*(L/32)^.5 Squaring on both sides (T/(2*pi))^2=L/32 Given time =4 sec L/32= (4/(2pi))^2 L/32= 4/10 L=128/10 L=12.8 Length of pendulum =12.8 units L/32=.