Mobile Ruler
With Mathematical thread (pendulum) you can easily measure the Gravitational acceleration constant. Use a known length thread to calibrate the app with measuring the gravitational acceleration constant (g), You must tie the phone to the end of the known length rope and use it like a pendulum. if it succeeded, you can measure length of a rope by tied to it, and using the whole mechanical system like a pendulum ( mathematical thread (pendulum)).
The mobile with the Mobile Ruler app started on it, will use the accelerometers (gyroscopes) to calculate the period time of the length, from that the g constant will be calculated first, after calibration the length of the rope,. If you use object to fix the swinging phone, the length will be calculated until the center of mass of the object.
Have a nice study
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