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Length of the rope, speed at which the pendulum is moving, friction between the rope and the air, the rope and its suspension point, and within the rope itself.
The period of the pendulum can be influenced by the local magnitude of gravity, by the length of the string, and by the density of the material in the swinging rod (which influences the effective length).It's not affected by the weight of the bob, or by how far you pull it to the side before you let it go.
The frequency is (36/60) per second.The period is the reciprocal of the frequency = (60/36) = 1-2/3 seconds
1 second = (1/60) 0.0166666 minutes
No number, by itself, makes it true.