Conservation of Angular Momentum Video Lessons

Video Thumbnail

Concept

Problem: A horizontal platform in the shape of a uniform disk (I = 1/2 MR  2 for an axis at its center) is rotating without friction about a vertical axis at its center. The platform has mass 8.00 kg and radius 0.400 m. The platform is initially rotating at an angular velocity of 0.300 rev/s. Then a small bag of sand with mass 6.00 kg is dropped from a small height onto the platform at its rim. The bag of sand can be treated as a point mass. What is the final angular velocity of the platform after the bag of sand has been dropped onto it?

FREE Expert Solution
87% (259 ratings)
Problem Details

A horizontal platform in the shape of a uniform disk (I = 1/2 MR  for an axis at its center) is rotating without friction about a vertical axis at its center. The platform has mass 8.00 kg and radius 0.400 m. The platform is initially rotating at an angular velocity of 0.300 rev/s. Then a small bag of sand with mass 6.00 kg is dropped from a small height onto the platform at its rim. The bag of sand can be treated as a point mass. What is the final angular velocity of the platform after the bag of sand has been dropped onto it?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Conservation of Angular Momentum concept. You can view video lessons to learn Conservation of Angular Momentum. Or if you need more Conservation of Angular Momentum practice, you can also practice Conservation of Angular Momentum practice problems.

How long does this problem take to solve?

Our expert Physics tutor, Jeffery took 4 minutes and 1 second to solve this problem. You can follow their steps in the video explanation above.