Two forces, f⃗ 1 and f⃗ 2, act at a point. f⃗ 1 has a magnitude of 8.00 n and is directed at an angle of 60.0 ∘ above the negative x axis in the second quadrant. f⃗ 2 has a magnitude of 5.20 n and is directed at an angle of 53.6 ∘ below the negative x axis in the third quadrant.

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.