# Kinetic Energy of a rotating bar

A thin, uniform 12.0-kg bar that is 2.00 m long rotates uniformly about a pivot at one end, making 5.00 complete revolutions every 3.00 seconds.

What is the kinetic energy of this bar? (Hint: Different points in the bar have different speeds. Break the bar up into infinitesimal segments of mass dm and integrate to add up the kinetic energy of all these segments.)

Â© BrainMass Inc. brainmass.com March 4, 2021, 6:54 pm ad1c9bdddfhttps://brainmass.com/physics/energy/kinetic-energy-rotating-bar-68524

#### Solution Preview

Please see the attached file.

SOLUTION

5 revolutions

12 kg every 3 sec.

2m

...

#### Solution Summary

Step by step solution provided. The expert determines the kinetic energy of a rotating bar.

$2.49