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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.
Posted on. (Answer #1). For a simple pendulum, where the pendulum is itself considered of negligible mass which moves with a minimal amplitude, the time period is given by the formula. T = 2(pi)*(sqrt(L/g)). where T is the time period, L is the length of the pendulum, and g is the gravitational constant.By lengthening the pendulum, the weight at the end must travel a longer distance as it swings, which means more time is required for it to complete a given period. = 2(pi)*(sqrt(L/g)). where T is the time period, L is the length of the pendulum, and g is the gravitational constant. By lengthening the pendulum, the weight at the end must travel a longer distance as it swings, which means more time is required for it to complete a given period.