B Calculate Gravity with Ruzanna from the Netherlands

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Ruzanna, a 14-year-old from the Netherlands, is conducting a physics project to calculate local gravity using a pendulum and seeks assistance from international participants. She explains the experiment's requirements, including measuring the pendulum's length and timing its swings, while also addressing concerns about the project's integrity. Participants offer insights on improving accuracy, emphasizing the importance of using a thin, strong string and conducting multiple trials for reliable results. Discussions highlight variations in gravity measurements from different locations and the significance of precise timing in calculations. The thread concludes with Ruzanna expressing gratitude for the help received and noting the project's educational value.
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Reply to Sohiecentaur: Having a 1 sec period clock simplifies calculations. (most wall clocks are were designed with 1 sec period) The point mass is not important since pendulum length is not measured but calculated from the pendulum formula. I know the formula for gravity works, because I used it to set the clock to 10 second precision in a week after being repaired. I live In Mendoza, Argentina where latitude at my home is 31.919859 degrees South and at HASL = 821 m, then g is far from 9.806.m/sec2 (Actually it is 9.76462 m/sec2.. This g gave me a theoretical value for L = 247.34 mm which I never measured but allowed me to calculate how many turns to give to the adjustment nut once I have the delay/advance of the clock in 7 days. You can use other number of days, but for my clock it was the period for recharge the spring motors (is it the correct name?) It was really more fun than engineering task!
 

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