Final answer:
The length of a pendulum with a period of 0.939 s is approximately 18.87 cm.
Step-by-step explanation:
The period of a pendulum is the time it takes for one full oscillation. It is given by the formula:
T = 2π√(L/g)
where T is the period, L is the length of the pendulum, and g is the acceleration due to gravity. To find the length of the pendulum, we can rearrange the formula and solve for L:
L = (T^2 * g) / (4π^2)
Plugging in the values, we get:
L = (0.939^2 * 9.8) / (4π^2)
L ≈ 18.87 cm