Estimate frequency of vibration of your arm. let the length of the arm be 0.57 m. consider the arm as a simple pendulum and assume its center of mass is about 2/3 its length from the shoulder. express your answer with the appropriate units. estimate the natural period of vibration of your arm.

0.80865 Hz

1.23662 seconds

Explanation:

g = Acceleration due to gravity = 9.81 m/s²

l = Length of arm = 0.57 m

Length of simple pendulum is given by

The frequency is given by

The frequency is 0.80865 Hz

The time period is given by

The time period is 1.23662 seconds

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.