The mass in a pendulum clock completes one complete swing in 1.20 s. part a what is the length of the rod?

T = 2π√ (L/g)

where

T is the period in seconds (s)

π is the Greek letter pi and is approximately 3.14

√ is the square root of what is included in the parentheses

L is the length of the rod or wire in meters or feet

g is the acceleration due to gravity (9.8 m/s² or 32 ft/s² on Earth)

L = gT ² / 4π ²

L = 9.8 m/s² * (1.20s) ² : 4 (3.14) ²

L = 9.8 m/s² * 1.44 s² : 4 (9.86)

L = 14.11 m : 39.44

L = 0.36 m

The length of the rod is 0.36 meters