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Problem: A uniform steel bar swings from a pivot at one end with a period of 2.1s? How long is the bar?

FREE Expert Solution

This is a pendulum problem.

Periodic time:

T=2πImgR where I is the moment of inertia of the bar, m is its mass, g is gravitational acceleration, and R is the distance between the pivot and the center of mass.

Moment of inertial of a rod about the end:

I=13mL2 where m is the mass and L is the length.

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Problem Details

A uniform steel bar swings from a pivot at one end with a period of 2.1s? How long is the bar?

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