A pendulum set up in the stairwell of a tall building consists of a steel ball of mass 493 kg suspended at the end of a 47.0 m wire. What is the period of oscillation?
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Time, seconds = 2(pi) x (square root of l/g).... .l= pendulum length, meters............g = gravitational constant ( meters per second squared)...................mass is not a factor.
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I'm out of engineering college for 21 years. Don't remember the formula. The mass is immaterial. Put the length of the suspending wire in the formula you will get the answer.