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A pendulum makes 36 vibrations in exactly 60 s. What is its (a) period, and (b) frequency? 7. How long must a simple pendulum be if it is to make exactly one swing per second? (That is, one complete vibration takes exactly 2.0 s.) 8.. If a simple pendulum whose length is 1.50 m makes 72 oscillations in 3.00 min, what is the acceleration of gravity at its location? 5. A 2500 kg demolition ball swings on a cable 17.0 m long.
Best Answer: Your formula for the complete cycle period of a SIMPLE pendulum is: T = 2*Pi*sqrt(L/g) L is the length, g is the local gravitational field. sqrt() indicates the square root function. And Pi is the famous 3.14159 number, the ratio of circumference to diameter of any circle. If you quadruple the length of a simple pendulum, you will double the period of swing. In order to triple the period, you would need to increase the pendulum's length 9-fold. I use and emphasize the word simple, because the contrary is a physical pendulum.